Discoveries from the IBEX satellite show we still don't know quite a few things about the heliosphere and solar system

Voyagers 1 and 2 reached the termination shock in 2005 and 2007, respectively, taking point measurements as they left the solar system. Before IBEX, there was only data from these two points at the edge of the solar system. While exciting and valuable, the data they provided about this region raised more questions than they resolved. IBEX has filled in the entire interaction region, revealing surprising details completely unpredicted by any theories. IBEX completes one all-sky map every six months. IBEX completed the first map of the complex interactions occurring at the edge of the solar system (shown) this summer. (Credit: SwRI via Science Daily)

From the University of Chicago

Satellite reveals surprising cosmic ‘weather’ at edge of solar system

IMAGE: Image from one of the IBEX papers published in the Oct. 16, 2009, issue of Science showing a map of the ribbon of energetic neutral atoms (in green and yellow)…

The first solar system energetic particle maps show an unexpected landmark occurring at the outer edge of the solar wind bubble surrounding the solar system. Scientists published these maps, based mostly on data collected from NASA’s Interstellar Boundary Explorer satellite, in the Oct. 15 issue of Science Express, the advance online version of the journal Science.

“Nature is full of surprises, and IBEX has been lucky to discover one of those surprises,” said Priscilla Frisch, a senior scientist in astronomy & astrophysics at the University of Chicago. “The sky maps are dominated by a giant ribbon of energetic neutral atoms extending throughout the sky in an arc that is 300 degrees long.” Energetic neutral atoms form when hot solar wind ions (charged particles) steal electrons from cool interstellar neutral atoms.

IBEX was launched Oct. 19, 2008, to produce the first all-sky maps of the heliosphere, which reaches far beyond the solar system’s most distant planets. Extending more than 100 times farther than the distance from Earth to the sun, the heliosphere marks the region of outer space subjected to the sun’s particle emissions.

The new maps show how high-speed cosmic particle streams collide and mix at the edge of the heliosphere, said Frisch, who co-authored three of a set of IBEX articles appearing in this week’s Science Express. The outgoing solar wind blows at 900,000 miles an hour, crashing into a 60,000-mile-an-hour “breeze” of incoming interstellar gas.

Revealed in the IBEX data, but not predicted in the theoretical heliosphere simulations of three different research groups, was the ribbon itself, formed where the direction of the interstellar magnetic field draping over the heliosphere is perpendicular to the viewpoint of the sun.

IMAGE: Priscilla Frisch, Senior Scientist in Astronomy & Astrophysics, and member of the science team, Interstellar Boundary Explorer. Collaborating with former UChicago astronomer Thomas F. Adams, she made the first spectrum…

Energetic protons create forces as they move through the magnetic field, and when the protons are bathed in interstellar neutrals, they produce energetic neutral atoms. “We’re still trying to understand this unexpected structure, and we believe that the interstellar magnetic forces are associated with the enhanced ENA production at the ribbon,” Frisch said.

IBEX shows that energetic neutral atoms are produced toward the north pole of the ecliptic (the plane traced by the orbit of the planets around the sun), as well as toward the heliosphere tail pointed toward the constellations of Taurus and Orion. “The particle energies change between the poles and tail, but surprisingly not in the ribbon compared to adjacent locations,” Frisch said.

###

IBEX is the latest in NASA’s series of low-cost, rapidly developed Small Explorers space missions. Southwest Research Institute in San Antonio, Texas, leads and developed the mission with a team of national and international partners. NASA’s Goddard Space Flight Center in Greenbelt, Md., manages the Explorers Program for NASA’s Science Mission Directorate in Washington.

Citations: N. A. Schwadron, M. Bzowski, G. B. Crew, M. Gruntman, H. Fahr, H. Fichtner, P. C. Frisch, H. O. Funsten, S. Fuselier, J. Heerikhuisen, V. Izmodenov, H. Kucharek, M. Lee, G. Livadiotis, D. J. McComas, E. Moebius, T. Moore, J. Mukherjee, N.V. Pogorelov, C. Prested, D. Reisenfeld, E. Roelof, G.P. Zank, “Comparison of Interstellar Boundary Explorer Observations with 3-D Global Heliospheric Models,” Science Express, Oct. 15, 2009.

H.O. Funsten, F. Allegrini, G.B. Crew, R. DeMajistre, P.C. Frisch, S.A. Fuselier, M. Gruntman, P. Janzen, D.J. McComas, E. Möbius, B. Randol, D.B. Reisenfeld, E.C. Roelof, N.A. Schwadron, “Structures and Spectral Variations of the Outer Heliosphere in IBEX Energetic Neutral Atom Maps,” Science Express, Oct. 15, 2009.

D.J. McComas, F. Allegrini1, P. Bochsler, M. Bzowski, E.R. Christian, G.B.Crew, R. DeMajistre, H. Fahr, H. Fichtner, P.C. Frisch, H.O. Funsten, S. A. Fuselier, G. Gloeckler, M. Gruntman, J. Heerikhuisen, V. Izmodenov, P.J anzen, P. Knappenberger, S. Krimigis, H. Kucharek, M. Lee, G. Livadiotis, S. Livi, R.J. MacDowall, D. Mitchell, E. Möbius, T. Moore, N.V. Pogorelov, D. Reisenfeld, E. Roelof, L. Saul, N.A. Schwadron, P.W. Valek, R. Vanderspek, P. Wurz, G.P. Zank, “Global Observations of the Interstellar Interaction from the Interstellar Boundary Explorer-IBEX”, Science Express, Oct. 15, 2009.

Related links:

Animation shows how energetic neutral atoms are made in the heliosheath when hot solar wind protons grab an electron from a cold interstellar gas atom. The ENAs can then easily travel back into the solar system, where some are collected by IBEX. Credit: NASA/GSFC http://www.swri.org/temp/ibexscience/DM/SP_draft1.mov

Solar Journey: The Significant of Our Galactic Environment for the Heliosphere and Earth, Priscilla C. Frisch, editor. http://www.springer.com/astronomy/practical+astronomy/book/978-1-4020-4397-0

IBEX Web page at Southwest Research Institute http://ibex.swri.edu/

NASA’s Interstellar Boundary Explorer mission http://www.nasa.gov/mission_pages/ibex/index.html

To view a video related to this research, please visit http://astro.uchicago.edu/%7Efrisch/soljourn/Hanson/AstroBioScene7Sound.mov


Here is another press release on IBEX from Boston University:

IBEX discovers that galactic magnetic fields may control the boundaries of our solar system

NASA mission reveals impact of galaxy’s magnetic fields

(Boston) – The first all-sky maps developed by NASA’s Interstellar Boundary Explorer (IBEX) spacecraft, the initial mission to examine the global interactions occurring at the edge of the solar system, suggest that the galactic magnetic fields had a far greater impact on Earth’s history than previously conceived, and the future of our planet and others may depend, in part, on how the galactic magnetic fields change with time.

“The IBEX results are truly remarkable, with emissions not resembling any of the current theories or models of this never-before-seen region,” says Dr. David J. McComas, IBEX principal investigator and assistant vice president of the Space Science and Engineering Division at Southwest Research Institute. “We expected to see small, gradual spatial variations at the interstellar boundary, some 10 billion miles away. However, IBEX is showing us a very narrow ribbon that is two to three times brighter than anything else in the sky.”

A “solar wind” of charged particles continuously travels at supersonic speeds away from the Sun in all directions. This solar wind inflates a giant bubble in interstellar space called the heliosphere — the region of space dominated by the Sun’s influence in which the Earth and other planets reside. As the solar wind travels outward, it sweeps up newly formed “pickup ions,” which arise from the ionization of neutral particles drifting in from interstellar space. IBEX measures energetic neutral atoms (ENAs) traveling at speeds of roughly half a million to two and a half million miles per hour. These ENAs are produced from the solar wind and pick-up ions in the boundary region between the heliosphere and the local interstellar medium.

The IBEX mission just completed the first global maps of these protective layers called the heliosphere through a new technique that uses neutral atoms like light to image the interactions between electrically charged and neutral atoms at the distant reaches of our Sun’s influence, far beyond the most distant planets. It is here that the solar wind, which continually emanates from the Sun at millions of miles per hour, slams into the magnetized medium of charged particles, atoms and dust that pervades the galaxy and is diverted around the system. The interaction between the solar wind and the medium of our galaxy creates a complex host of interactions, which has long fascinated scientists, and is thought to shield the majority of harmful galactic radiation that reaches Earth and fills the solar system.

“The magnetic fields of our galaxy may change the protective layers of our solar system that regulate the entry of galactic radiation, which affects Earth and poses hazards to astronauts,” says Nathan Schwadron of Boston University’s Center for Space Physics and the lead for the IBEX Science Operations Center at BU.

Each six months, the IBEX mission, which was launched on October 18, 2008, completes its global maps of the heliosphere. The first IBEX maps are strikingly different than any of the predictions, which are now forcing scientists to reconsider their basic assumptions of how the heliosphere is created.

“The most striking feature is the ribbon that appears to be controlled by the magnetic field of our galaxy,” says Schwadron.

Although scientists knew that their models would be tested by the IBEX measurements, the existence of the ribbon is “remarkable” says Geoffrey Crew, a Research Scientist at MIT and the Software Design Lead for IBEX. “It suggests that the galactic magnetic fields are much stronger and exert far greater stresses on the heliosphere than we previously believed.”

The discovery has scientists thinking carefully about how different the heliosphere could be than they expected.

“It was really surprising that the models did not generate features at all like the ribbon we observed,” says Christina Prested, a BU graduate student working on IBEX. “Understanding the ribbon in detail will require new insights into the inner workings of the interactions at the edge of our Sun’s influence in the galaxy.”

Adds Schwadron,”Any changes to our understanding of the heliosphere will also affect how we understand the astrospheres that surround other stars. The harmful radiation that leaks into the solar system from the heliosphere is present throughout the galaxy and the existence of astrospheres may be important for understanding the habitability of planets surrounding other stars.”

###

IBEX is the latest in NASA’s series of low-cost, rapidly developed Small Explorers space missions. Southwest Research Institute in San Antonio, Texas, leads and developed the mission with a team of national and international partners. NASA’s Goddard Space Flight Center in Greenbelt, Md., manages the Explorers Program for NASA’s Science Mission Directorate in Washington.

The Center for Space Physics at Boston University carries out a wide variety of research in space physics including: space plasma physics, magnetospheric physics, ionospheric physics, atmospheric physics, and planetary and cometary atmospheric studies.

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James F. Evans
October 24, 2009 7:40 am

Dr. Svalgaard presents Evans’ statement: “No magnetic field’s presence is required for the electromotive force to act as an attraction between free electrons and positive ions.”
And Dr. Svalgaard responds: “You do evidently not know what emf is;
In a cosmic plasma [Wiki]: “the emf is due solely to a time-varying magnetic field that generates an electrical voltage that in turn drives the current.”
Well, so Dr. Svalgaard is reduced to relying on Wikipedia, now.
But I checked Wikipedia cosmic plasma (yes, I check citations), it’s actually listed as Astrophysical plasma — but it does not state what Dr. Svalgaard has claimed for it. Rather, the closest it comes is this, “All known astrophysical plasmas are influenced by magnetic fields. Since plasmas contain equal numbers of electrons and ions, they are electrically neutral overall and thus electric fields play a lesser dynamical role.”
(if Dr. Svalgaard thinks I’ve linked the wrong Wikipedia entry, he can link the correct entry and I’d be glad to look at it.)
There is nothing about “the emf is due solely to a time-varying magnetic field that generates an electrical voltage that in turn drives the current.”
There is no quote as Dr. Svalgaard has represented (see link Wiki entry below).
http://en.wikipedia.org/wiki/Astrophysical_plasma
Wikipedia has no in situ experimental verification of its claim and neither does Dr. Svalgaard (of course, Dr. Svalgaard states there is no need to test this claim in contravention of the empirical scientific method).
I’ll rely on a quote for my authority by Dr. Eugene N. Parker, astrophysicist:
“…magnetic fields appear only in association with electric currents and in association with time varying electric fields…In the laboratory we create static magnetic fields by driving an electric current through a coil of wire. The emf [electromotive force] driving the current is the sourse of the energy that creates the magnetic field, so emf [electromotive force] and [electric] current are clearly the CAUSE (emphasis original) of the magnetic field.”
Conversations on electric and magnetic fields in the cosmos (page 25)
http://books.google.com/books/p/princeton?id=7gJ_i3CTcpQC&printsec=frontcover&source=gbs_ViewAPI&hl=en#v=onepage&q=&f=false
As Dr. Parker makes clear, “magnetic fields appear only in association with electric currents and in association with time varying electric fields”.
So, Dr. Svalgaard has substituted “time-varying magnetic field” for Dr. Parker’s, ” time varying electric fields”, an obvious change of terms.
It would seem like Dr. Svalgaard has engaged in a rather sophmoric and obvious attempt at misleading the reader.
Oh, and while I’m at it, Dr. Parker’s quoted passage backs up my interpretation of the electromotive force 100%.
Dr. Svalgaard you are getting careless in your desperation.

October 24, 2009 8:27 am

James F. Evans (07:40:08) :
Well, so Dr. Svalgaard is reduced to relying on Wikipedia, now.
At your level, even that may be aiming too high.
Parker:
“In the laboratory we create static magnetic fields by driving an electric current through a coil of wire. The emf [electromotive force] driving the current is the source of the energy that creates the magnetic field, so emf [electromotive force] and [electric] current are clearly the cause of the magnetic field.”
Continuation of the quote:
“On the other hand, in the cosmos the deformation of the magnetic field embedded in the swirling plasma causes the flow of electric current […] because the energy that drives the current comes from the magnetic field […] In view of the small but non-vanishing friction between the relative motions of the electrons and ions, there is a continuing trickle of energy from the magnetic field to the current to maintain the flow of current required by Ampere’s law, from which it follows that the field is the continuing cause of the current and not vice versa.
the curious popular notion that the electric current causes the magnetic fields in the cosmos has led to the even more curious notion that the electric current is the more fundamental dynamical variable. […] The current is dynamically passive, consisting of no more than the tiny inertia of the electron conduction velocity, while, […] the stresses in the electric field are small to second order [c.f. my theoretical derivation a while back] in v/c and are quite negligible. The dynamics of the plasma-magnetic field system is driven by the magnetic stress and the inertia and pressure of the plasma”.
Your selective quoting [omitting the very next sentence] speaks volumes to either inability or conceit. Pick your choise.
my interpretation of the electromotive force 100%.
The emf has a standard meaning in physics and is not subject to your interpretation.

October 24, 2009 8:55 am

Leif Svalgaard (07:21:38) :
…………
HCS is a different current to field aligned current. If “I” is an electric current vector due to a single particle, than field aligned current is Z component while HSC is tangential (made of X and Y components). Density might be low in the solar wind, but certainly is not in top layers of solar surface and perhaps in flares and CMEs. In my initial post I did provide explanation how whole process arises in plasma, including cause of acceleration of solar wind (which astrophysics ofyour interpretation does not have an explanation for). The same physical laws have to be satisfied in any circumstance, be it a laboratory, solar wind, magnetosphere, solar corona or photosphere.
If under gyrations of a particle you have in mind its progressive spiralling, i.e. helical progression than it has to have a field aligned current component. If by gyration you mean planar circular motion of a particle (which I am sure you do not) than Z component for an individual particle’s current = 0. Plasma is always propelled along towards somewhere (no 0 K degree temp in the known Universe) and since a random movement within mass of charged particles is physical impossibility (see my initial post, than field aligned helical current of a charged particle and its associated helical magnetic field are inseparable whatever circumstances.
It should be noted that up to now I have assumed that particles ‘linear’ progression is at the same speed, but in reality that is not always the case, as Ulysses space probe discovered, in which case a potential difference arises along the path, then Z components of two sets of currents gives a rise to ‘macro’ field aligned current. Two currents trough a particular section S are: I1= n1Sv1Q1 , I2= n2Sv2Q2, charges Q1= -Q2 = Q , number of particles n1= n2 = n v1 and v2 are different velocities, then resultant current is : I=I1+I2 = nS Q(v1-v2). In space this may result in a sort of ‘bunching’ of particles along their progression, so this would be a spatially alternative current.
My interpretation does comply with the all known laws of physics (lab or space), so I will stick to it, since it makes sense to me, while your interpretation apparently depends on different set of rules, and since you are happy with such dichotomy of interpretation, I am not here to change your mind, but to present somewhat different alternative.

James F. Evans
October 24, 2009 9:33 am

Dr. Svalgaard:
Of course, you ignore the fact that you were caught red-handed making up out of whole cloth, a fabricated quote from Wikipedia.
As for the quote I presented and the reason it was not necessary to quote any further, it is simple enough: It was not germane to the point I was making (but yes I did cite the page number and link the material so readers could read for themselves), which was in regards to the emf, electromotive force, and its action on ionized particles, free electrons and positive ions, charge seperated particles. As Dr. Parker makes clear it is the electromotive force that is the first cause (remember the causation principle in physics) — not magnetic fields — for charged particle motion, which is electric current.
Also, the other reason is this: Like you, Dr. Parker offers NO experimental results of any kind to back up his claims that “somehow” space plasma and electromagnetic processes act differently in space as opposed to the clear experimental results obtained, here, on Earth, which is what my original quote was memorializing. I’ll acknowledge a brief notation of Dr. Parker’s unsupported claims could have been made (although, why embarrass the old man, he’s 82 years old).
Dr. Svalgaard what is your reason for making up a Wikipedia quote out of thin air?
The explanation I gave for the electromotive force is the correct definition, as confirmed by Dr. Parker’s statement and countless other authorities.
Why do you persist in attempting to mislead the reader?
Dr. Svalgaard your conduct (making up whole cloth quotations and other transgressions) is a prime example of sociopathic science.
Your hubris is preventing you from quitting while you are behind (but it could still get worse), or seeing how others perceive your conduct.
It is sad when “belief” and reputation and dogma are more important than science.

October 24, 2009 9:53 am

vukcevic (08:55:48) :
to present somewhat different alternative
There is only one physics. No alternatives. We have had this very discussion so many times, but please spare the folks. And BTW, of course we know why there is a solar wind [we have known this more than 50 years]: the corona is hot, very hot, and conducts heat very efficiently. The corona is simply evaporating. Interesting enough, it is by climbing out of the Sun’s gravity well that the solar wind becomes supersonic [check ‘de laval nozzle solar wind’]. There are a number of explanations for the heating. We don’t know yet which ones are the dominant of effective ones, but there is no lack of mechanisms.
Look now again at the HCS. The magnetic field near the HCS at some distance from the Sun is mainly transverse to the direction to the sun [because the sun is rotating the foot point of the field line away from the radial – already at the Earth, there is 45 degree angle between the field and the radial; at Pluto, the angle is 89 degrees]. The solar wind flows almost radially at all distances and is thus not ‘propelled along a field line’. You have the basic physics completely wrong, as we have seen so many times. The amazing thing is your inability to learn [shared with that other poster].

October 24, 2009 9:59 am

James F. Evans (09:33:27) :
Of course, you ignore the fact that you were caught red-handed making up out of whole cloth, a fabricated quote from Wikipedia.
[…]
what is your reason for making up a Wikipedia quote out of thin air?

http://en.wikipedia.org/wiki/Electromotive_force
scroll down to:
Electromotive force and voltage difference
then down to:
“For a circuit consisting of an electrical generator that drives current through a resistor, the emf is due solely to a time-varying magnetic field that generates an electrical voltage that in turn drives the current.”

October 24, 2009 11:06 am

Leif Svalgaard (09:53:35) :
“of course we know why there is a solar wind”
That is not what I said, I said “including cause of acceleration of solar wind” which is totally different matter.
As far as particle, current and magnetic field are concerned, should not be there any ambiguity as it has been resolved by experts in the field: Birkeland, Alfvén and Boström.
Quote: “Regardless of scale, the motion of charged particles produces a self-magnetic field that can act on other collections of charged particles, internally or externally. Plasmas in relative motion are coupled via currents that they drive through each other” -Peratt (1992)
I have no problem with ‘de Laval nozzle principle for solar wind’, for initial acceleration, but you also ignored a statement I made in my post:
“Gravity force may impede on this self propulsion, but as gravitation forces weaken plasma flow will accelerate. This is one of the properties of the solar wind. The energy required for whole process comes from the thermal energy of plasma particles.”
Nothing wrong there with my basic physics.
“There is only one physics.”
Absolutely agree: I assume you will not claim again that plasma in a lab is subject to one set of laws and in the space to another. The same physical laws have to be satisfied in any circumstance, be it a laboratory, solar wind, magnetosphere, solar corona or photosphere, and my view conforms with those.
To be honest I given up reading James F. Evans’ and yours posts, I do not agree with either of you, and as far as I can see you are just going in circles, nothing new there for some time.

James F. Evans
October 24, 2009 11:47 am

Dr. Svalgaard presents vukcevic’s statement: “to present somewhat different alternative”
And Dr. Svalgaard responded: “There is only one physics.”
Yes, that is true, but what that physics is, is another question entirely.
Good Science is constantly questioning and conducting experiments and observing & measuring to further Man’s understanding toward that “one physics”, most likely Man will never get there to absolute knowledge.
But hopefully that will never be for lack of trying and imagination.
Dr. Svalgaard presupposes that he is in possession of the one “true physics”.
Good Science is constantly investigating alternatives, without alternative ideas science would stagnate into dogma and “belief”.
Obviously, some alternatives are better than others, that’s why science is constantly testing to either falsify or verify hypothesis, a bedrock principle of the empirical scientific method.
Good science does not rely on theoretical constructs and declare there is no reason for experiments be they insitu observation & measurement or laboratory experiment.
It’s naked hubris that drives Dr. Svalgaard to believe he is in possession of the one “true physics”.
Enough of philosophy.
Dr. Svalgaard makes an offering of a Wikipedia entry on Electromotive Force, presumably to suggest that is what he really meant, above, when he cited a Wikipedia entry on cosmic plasma with a quote that was clearly not in the astrophysical plasma entry.
To be fair and give the benefit of the doubt (what little doubt there is), allow Dr. Svalgaard a muligan.
But the Wikipedia entry on electromotive force starts off: “In physics, electromotive force, or most commonly emf (seldom capitalized), or (occasionally) electromotance is “that which tends to cause current (actual electrons and ions) to flow.”
And goes on: “The electric potential difference is created by separating positive and negative charges, thereby generating an electric field. The created electrical potential difference drives current flow if a circuit is attached to the source of emf.”
And it goes on further: “Devices that can provide emf include voltaic cells, thermoelectric devices, solar cells, electrical generators, transformers, and even Van de Graaff generators.
In the case of a battery, charge separation that gives rise to a voltage difference is accomplished by chemical reactions at the electrodes
“For a circuit consisting of an electrical generator that drives current through a resistor, the emf is due solely to a time-varying magnetic field that generates an electrical voltage that in turn drives the current.”
Dr. Svalgaard presents a statement from the Wikipedia entry: “For a circuit consisting of an electrical generator that drives current through a resistor, the emf is due solely to a time-varying magnetic field that generates an electrical voltage that in turn drives the current.”
Obviously, as the quote above Dr. Svalgaard’s quote from the Wikipedia entry makes clear, an “electrical generator” is only one way to produce electrical current among many. Dr. Svalgaard has brought this up before and it has been pointed out to him that the electric current is generated by the rotation of a bar magnets past an electrically conductive material, but the magnetic field in the bar magnet is due to orderred electron motion or “spin” of the electrons.
The first cause of the bar magnet’s magnetic field is electron motion, charged particle motion. The electric current caused by the generator is a secondary effect, which has already been discussed.
There are various theories for the magnetic field in the bar magnet, but they always boil down to orderred electron motion in some fashion.
So, as been stated, here, ad nauseam, electron motion, electric current causes magnetic fields.
Dr. Svalgaard takes a valid quote and uses it out of context to serve his own ends.

October 24, 2009 12:00 pm

vukcevic (11:06:55) :
That is not what I said, I said “including cause of acceleration of solar wind” which is totally different matter.
No, the acceleration of the solar wind is a natural consequence of it not being in hydrostatic equilibrium as Parker showed 52 years ago and has nothing to do with electric currents or magnetic fields. His fundamental equation governing solar wind speed is dV/dr = [2a^2/r – GMo/r^2)]/[V – a^2/V] which you can find in any textbook or internet page on this. The inner solar wind is accelerated outward by about the same [coincidental] amount as gravity at the Earth’s surface.
As far as particle, current and magnetic field are concerned, should not be there any ambiguity as it has been resolved by experts in the field: Birkeland, Alfvén and Boström.
I’m an expert in this field, too. And BTW, have often discussed this in detail with Hannes who was a good friend of mine.
“Gravity force may impede on this self propulsion, but as gravitation forces weaken plasma flow will accelerate.
Gravity actually [the de Laval Nozzle effect] is a necessary ingredient in accelerating the solar wind to supersonic speeds. [same in rocket engines]
The same physical laws have to be satisfied in any circumstance, be it a laboratory, solar wind, magnetosphere, solar corona or photosphere, and my view conforms with those.
Where you go completely wrong is that the same laws work differently depending on the boundary conditions [mainly conductivity, density, and length scale – for example the gyroradius is cosmic plasmas is typically of the order of centimeters compared to the linear extend of the plasma – thousand or millions of kilometers]
To be honest I given up reading James F. Evans’ and yours posts, I do not agree with either of you, and as far as I can see you are just going in circles, nothing new there for some time.
Well, he is like you: nothing new there for some time. For you and for him, this is not a question about agreement, but of learning.

October 24, 2009 1:08 pm

Leif Svalgaard (12:00:51) :
“the acceleration of the solar wind is a natural consequence of it not being in hydrostatic equilibrium as Parker showed 52 years ago and has nothing to do with electric currents or magnetic fields. His fundamental equation governing solar wind speed is dV/dr = [2a^2/r – GMo/r^2)]/[V – a^2/V] which you can find in any textbook or internet page on this.”
Parker equation appears to be based on the ‘gas law’ where mass and energy are conserved. Gas expansion needs to take into account Brownian motion with thermal energy as a driver.
You again ignored basic premise of my post, that plasma is not and does not behave as an idealised gas, or any gas unless is partially or predominantly ionised, when it is plasma. So in order not to search for it I will repeat it again.
“Ordinary particles without charge in Brownian motion move in random directions, charge particles do not. In one of his first major theoretical works Einstein has shown in 1905 that Brownian motion on the atomic and molecular scale is a function of the particles’ size, implying that protons and electrons move at different speeds and acceleration, resulting in rise of potential difference and electric currents on a micro scale.
Collisions of charged particles in plasmas are quite different from normal neutral particle collisions. Neutral particles move independently along straight-line trajectories between distinct collision events, which are typically strong, inelastic events that cause the neutral particle to be scattered in an approximately random direction. In contrast, a charged particle moving through a plasma simultaneously experiences (and is deflected by) the weak Coulomb electric field forces around all the nearby charged particles as it passes by each of them. Since the electric fields around the individual charged particles are quite weak and Coulomb collisions are elastic (energy-conserving), they individually lead to typically only very small deflections in the direction of motion Thus, the trajectory of a charged particle is influenced by many simultaneous, small angle deflections in its direction of motion.
Again quote: “Regardless of scale, the motion of charged particles produces a self-magnetic field that can act on other collections of charged particles, internally or externally. Plasmas in relative motion are coupled via currents that they drive through each other”

October 24, 2009 5:23 pm

vukcevic (13:08:21) :
You again ignored basic premise of my post, that plasma is not and does not behave as an idealized gas
You premise is wrong and therefore the rest. To save me a long and tedious typing session, it is convenient to quote Wikipedia [also because wiki happens to be correct on this].
http://en.wikipedia.org/wiki/Plasma_parameter
The ideal plasma approximation:
One of the criteria which determine whether a collection of charged particles can rigorously be termed an ideal plasma is that Λ>>1. When this is the case, collective electrostatic interactions dominate over binary collisions, and the plasma particles can be treated as if they only interact with a smooth background field, rather than through pairwise interactions (collisions) [3]. The equation of state of each species in an ideal plasma is that of an ideal gas.
Plasma properties and Λ
Λ<>1
Ionospheric physics
Magnetic fusion devices
Space plasma physics
Plasma ball
I’m tired now. Hopefully this will be the last time, I’ll have to set you straight on this.
About Birkeland, Alfven, and Bostroem:
Birkeland was completely wrong. He thought aurorae were caused by electron jets [currents!] form the Sun. His error was pointed out the Lindeman who showed that mutual repulsion would completely disperse the jet, and that a neutral plasma was needed.
Alfven was railing against misuse of his ideas. In the 1960s some people thought that the magnetic field lines were equipotentials, i.e. that no current could ever flow along them. This is clearly wrong as observations showed, but does not mean that ALL currents are field-aligned. In fact, most are not. What happens is that strong changes of the magnetic field can create an electric field that can accelerate electrons. Since electrons can move with ease along the magnetic field but not across, it is no wonder that we observe some come along the field. And Bostroem just suggested what the auroral current system might look like. None of this has any bearing on the subject under discussion.

October 24, 2009 7:06 pm

This didn’t show well enough:
Plasma properties and Λ
Λ>>1
Ionospheric physics
Magnetic fusion devices
Space plasma physics
Plasma ball

October 25, 2009 1:13 am

Dr. Svalgaard
Thanks for that link. That is far closer to what I was having in mind than clasic ‘gas law’, apparent bases of Parkers equation.
I agree, lets give it a rest. Your effort is not wasted, if I am a bit stubborn and not taking up your explanations readily, they are opening doors to many other readers, for which all of us thankful.

James F. Evans
October 25, 2009 2:03 am

Dr. Svalgaard: It is bad enough that you are willing to mislead about the science to protect your own belief system and reputation, but when you distort the record about other scientists and their achievements, you really reveal who you are.
Below is a passage from the Wikipedia entry for the solar wind:
“The ideas of Fitzgerald and others were further developed by the Norwegian physicist Kristian Birkeland. His geomagnetic surveys showed that auroral activity was nearly uninterrupted. As these displays and other geomagnetic activity were being produced by particles from the Sun, he concluded that the Earth was being continually bombarded by “rays of electric corpuscles emitted by the Sun”. In 1916, Birkeland was probably the first person to successfully predict that, “From a physical point of view it is most probable that solar rays are neither exclusively negative nor positive rays, but of both kinds”. In other words, the solar wind consists of both negative electrons and positive ions. Three years later in 1919, Frederick Lindemann also suggested that particles of both polarities, protons as well as electrons, come from the Sun.”
http://en.wikipedia.org/wiki/Solar_wind
There is a reason Birkeland currents are named in his honor.
Your willingness to distort and mislead are unbounded.
Of course, it has been pointed out to you that Sidney Chapman was wrong.
Chapman claimed the Earth was entirely isolated from the solar wind by the Earth’s magnetosphere.
Today, we know that the Earth is not isolated by the magnetosphere from the Sun’s solar wind.
As NASA recounts:
“In the 1930’s Chapman and Ferraro predicted that the plasma and magnetic fields from the Sun and the plasma and magnetic fields of the Earth would not mix. They thought that the magnetic field of the Earth could create a complete barrier to the solar wind. The boundary between the interplanetary magnetic field and the region dominated by the Earth’s magnetic field is called the Magnetopause. In the Chapman-Ferraro model, the plasma of the solar wind and the magnetic fields of the Sun slide over and around the Earth’s magnetosphere without any mixing.”
http://stargazers.gsfc.nasa.gov/resources/earth_magnetosphere.htm
I’ve seen you write before that Chapman was right. No he was not, but why you back him is simple, he was violently opposed to Hannes Alfven’s concepts, held that space is electrically neutral and held to the mechanical model that you cling to.
Dr. Svalgaard wrote: “I’m an expert in this field, too. And BTW, have often discussed this in detail with Hannes who was a good friend of mine.”
Please, you distort Hannes Alfven’s work, where he publically rejected “frozen in” magnetic field lines at his Nobel acceptance speech and wrote of “magnetic reconnection” as pseudo-science.
It is offensive that you would claim to be a friend of Alfven when you distort his work. No friend would do that. Only somebody willing to stab him in the back.
You reject Hannes Alfven’s ideas about space plasma being cellular and connected in circuits and a good number of his other ideas, as well.
But the advancement of scientific understanding as in situ satellite probes are sent into space will vindicate many if not most of Alfven’s ideas.
Such will not be the same for yours.
Perhaps, that is why you are contemptuous of the need for in situ satellite probes that could either falsify or confirm your claims.

October 25, 2009 10:25 am

vukcevic (01:13:38) :
That is far closer to what I was having in mind than classic ‘gas law’, apparent bases of Parkers equation.
You still miss the point. When the plasma parameter is much larger than one as it is for cosmic plasma, the plasma is an ideal classic gas.
James F. Evans (02:03:47) :
Birkeland was probably the first person to successfully predict that, “From a physical point of view it is most probable that solar rays are neither exclusively negative nor positive rays, but of both kinds”.
Of course, Birkeland had to say that because it was pointed out to him that if all streams were negative, the sun with be left with a steadily growing positive charge, so to avoid that, he assumed that some streams were positive and some were negative. That is not what we call a plasma today. Lindemann’s contribution was to realize that the streams would have to be neutral with equal mix of electrons and ions.
In the Chapman-Ferraro model, the plasma of the solar wind and the magnetic fields of the Sun slide over and around the Earth’s magnetosphere without any mixing.”
The initial phase of a magnetic storm is even today described by the generally accepted Chapman-Ferraro model.
It is offensive that you would claim to be a friend of Alfven when you distort his work. No friend would do that. Only somebody willing to stab him in the back.
Curiously, Hannes agreed with me during our discussions about the shape of the HCS.
But the advancement of scientific understanding as in situ satellite probes are sent into space will vindicate many if not most of Alfven’s ideas.
Indeed, satellites and spacecraft have corroborated our joint views on the magnetic structure of the solar wind [and Parker’s as well].
Your vitriol is wasted. I hope you have learned something about space plasmas during these exchanges.

October 25, 2009 11:32 am

James F. Evans (02:03:47) :
Birkeland
Read what Birkeland actually said in 1916:
http://docs.lib.noaa.gov/rescue/mwr/044/mwr-044-09-0508c.pdf
Eventually, he argued that perhaps both kinds of stream were possible [to avoid leaving the Sun with one charge only]. This is not what we call a plasma today, and Lindemann’s critique was correct.

Carla
October 25, 2009 12:17 pm

Are you through now Mr. Evans? (you burned me out too)
Would you care to address the effects of the neutral populations that are flowing thru the interior of the heliosphere at 1 AU? ( I am referring to the neutral H, He and O that flow from an area near the nose of the heliosphere to 1 AU and thru to the ah um tail of the heliosphere.
Direct Observations of Interstellar H, He, and O by the Interstellar Boundary
Explorer
Neutral gas of the local interstellar medium flows through
the inner solar system while being deflected by solar
gravity and depleted by ionization. The dominating
feature in the energetic neutral atom IBEX all-sky maps
at low energies is the H, He, and O interstellar gas flow.
The He and O flow peaked around 8 February in
accordance with gravitational deflection, whereas H
dominated after 26 March, consistent with approximate
balance of gravitational attraction by solar radiation
pressure. The flow distributions arrive from a few degrees
above the ecliptic plane and show the same temperature
for He and O. An asymmetric O distribution in ecliptic
latitude points to a secondary component from the outer
heliosheath.
Interstellar neutral gas flows through the inner heliosphere
due to the Sun’s motion relative to the local interstellar
medium (LISM), thus making interstellar gas measurements
possible from Earth’s orbit. Ionization of neutral atoms
approaching the Sun and the Sun’s gravitational field result in
a characteristic flow pattern and density structure in the inner
heliosphere with a cavity close to the Sun and gravitational
focusing on the downwind side (Fig. 1A). For H this pattern
is distinctly modified by radiation pressure, eliminating the
downwind focusing. Previous LISM H and He diagnostic
studies used UV backscatter observations (1, 2), pickup ion
studies (3, 4), and a combination of methods for He (5).
Making use of the Sun’s gravitational deflection, the velocity
distributions of various species can be studied in detail using
neutral atom imagers (6, 7) to derive interstellar gas
parameters, filtering of the species in the outer heliosheath,
and their deflection by interstellar magnetic field effects on
the plasma.
Figure 1A, 1B
http://i886.photobucket.com/albums/ac65/csspider57/temporary/DirectObservationsofInterstellar-1.jpg
24 August 2009; accepted 2 October 2009
Published online 15 October 2009; 10.1126/science.1180971
Include this information when citing this paper
For more see also..Carla (05:27:05) :10-20-2009
These neutrals just walk on thru and correspond with some of the other IBEX images for locations.

James F. Evans
October 26, 2009 2:09 pm

Dr. Svalgaard:
Regarding Birkeland, thank you for the pdf file, I take your point that at the time of the journal you provided he was still focussed on negative charges: “Birkeland considers that corpuscles are negative…”
I have no problem with Birkeland subsequently considering other evidence and interpretions and revising his considered opinion, on the contrary, that is an example of good science. It is an example of scientific process you seem to have difficulty with. Also, that doesn’t change the fact that Birkeland did later correctly identify that both positive and negative “corpuscles” were present. And if Lindemann added on with his own contribution, so much the better. In science, everybody stands on the shoulders of those that came before.
Dr. Svalgaard wrote, “…neutral with equal mix of electrons and ions.”
No. this is a confusion of terms. Any region which has ionized electrons and ions (quasi-neutral) there will be electromotive force or an electric field present, even with one free electron and one ion there will be a voltage potential drop between the two (however small that would be).
Dr. Svalgaard wrote: “The initial phase of a magnetic storm is even today described by the generally accepted Chapman-Ferraro model.”
That does not change the fact that Chapman maintained there was no mixing between the solar wind and Earth’s magnetosphere, which, today, science knows is wrong, which was my point in the first place — typical that you wouldn’t just “man up” and acknowledge that fact.
Dr. Svalggaard wrote: “Curiously, Hannes agreed with me during our discussions about the shape of the HCS.”
It does not surprise me in the least that Alfven would agree with you on that point (I acknowledge your pioneering work) because Alfven was broad-minded (from what I understand Alfven was dedicated to observation & measurement) and your work there was well supported by observation & measurement.
It is your present claims that aren’t supported by ANY observation & measurement whether in the laboratory or in situ that are problematic (more on that later).
Dr. Svalgaard your references to scientific theories from over 50 years ago regarding the solar wind are telling.
Dr. Svalgaard wrote: “And BTW, of course we know why there is a solar wind [we have known this more than 50 years]: the corona is hot, very hot, and conducts heat very efficiently. The corona is simply evaporating. Interesting enough, it is by climbing out of the Sun’s gravity well that the solar wind becomes supersonic [check ‘de laval nozzle solar wind’].”
Dr. Svalgaard wrote: “No, the acceleration of the solar wind is a natural consequence of it not being in hydrostatic equilibrium as Parker showed 52 years ago and has nothing to do with electric currents or magnetic fields.”
Vukcevic was right.
Dr. Svalgaard’s ideas, as I pointed out above in this thread are locked into the 1960’s, “hot gas, “kinetics”, and “pressure”, mechanical model or thermodynamic model. This mechanical model is outdated and has been shown to be for at least a decade (you are clinging to your glory days of the 1970’s) and is antiquated and naive if not simply false.
The wikipedia entry for solar wind specifically addresses this issue in the history section:
“However, the acceleration of the fast wind is still not understood and cannot be fully explained by Parker’s theory.”
Wikipedia goes on:
“In the late 1990s the Ultraviolet Coronal Spectrometer (UVCS) instrument on board the SOHO spacecraft observed the acceleration region of the fast solar wind emanating from the poles of the sun, and found that the wind accelerates much faster than can be accounted for by thermodynamic expansion alone. Parker’s model predicted that the wind should make the transition to supersonic flow at an altitude of about 4 solar radii from the photosphere; but the transition (or “sonic point”) now appears to be much lower, perhaps only 1 solar radius above the photosphere, suggesting that some additional mechanism accelerates the solar wind away from the sun.”
http://en.wikipedia.org/wiki/Solar_wind
Dr. Svalggard wrote: “But the advancement of scientific understanding as in situ satellite probes are sent into space will vindicate many if not most of Alfven’s ideas. Indeed, satellites and spacecraft have corroborated our joint views on the magnetic structure of the solar wind [and Parker’s as well].”
Structure and morphology is one thing (and is important), but the processes that drive the structure is just as important, and that is where you naively cling to the mechanical model where NASA and others have advanced into a more sophisticated understanding and model that accounts for the electrical and magnetic properties of the solar wind, helio current sheet, and coronal mass ejections, along with their interaction with the Earth’s magnetosphere.
The acceleration electrons and ions that is spoken of, above, is most likely a product of an electric field (always present where ionized particles are present) and this electric field is concentrated in the helio current sheet where the acceleration is most pronounced (electric fields cause charged particle acceleration).
I realize this discussion has been going ’round and ’round.
Carla, I suggest it is Dr. Svalgaard who wants to “burn” everybody out, principally myself, so he can cynically say to himself, “I got the last word,” and salvage is his ego, and make sure and protect the weaknesses in his claims.
But there is one final point that needs to be made and a hypothesis/prediction regarding this ribbon that needs to be stated.
Dr. Svalgaard claims the magnetic fields cause electric current in space. There is no experimental in situ evidence to support this claim (and blatently contradicts the known scientific results) and in fact Dr. Svalgaard has arrogantly claimed no in situ experiments are needed to verify his claims.
In Science, the burden of scientific evidence is on the proponent making the claim. Dr. Svalgaard’s position would reverse this burden essentially because he claims his hypothesis is right without any in situ experimental evidence at all.
At first I thought his insistence that no in situ experimental evidence was needed was because no in situ experimental results existed, which is true enough in itself, but there’s more to it than that.
Dr. Svalgaard’s claim can’t be falsified by in situ experiment.
It’s as if Dr. Svalgaard is claiming there are pink unicorns in space and saying no experimental evidence is needed to verify his claim.
What would an in situ observation & measurement find and record in space plasma?
Well, it would find an electric field in any region (even a region in ‘quasi-neutrality’) of space plasma because ionized electrons and ions which by definition cause an electric field are present in space plasma. There is no in situ experiment that would be able to record observations & measurements that could later tell you whether the electric field and electric current caused the magnetic field or vice versus.
So the reason Dr. Svalgaard insists no experimental evidence is needed is because he knows there is no experimental evidence that could falsify or verify his claim.
That is why he has worked so hard to claim by fiat that his hypothesis is corrent because once his claim has gained currency and been accepted there would be no possible way to falsify his claims and he could go on claiming it is right (as he has done here) and no one would be able to prove anything different.
This is an example of sociopathic science: Proposing a hypothesis that counters known experimental results, which one knows can’t be disproved once it has gained some level of acceptance, which would preserve his functionally “electrically neutral” claims, and which he tenaciously clings to, as does a rump of opinion in the astronomical community.
Dr. Svalgaard, if you think I got this all wrong and I’m needlessly maligning your character, please provide the in situ experiment that would either falsify or verify your claim.
Failure to address this request for an in situ experiment to test your assertion is prima facie evidence that in fact you are claiming something that can never be falsified, or verified. A “no, no” in the empirical scientific method. And that you knew this problem existed all along, but attempted to hide it.
Now, going on to the hypothesis/prediction.
The IBEX has recorded the ribbon on the heliosphere and the researchers have stated it is the magnetic field that is dominating this process, and this has been observed & measured during this solar minimum. And the researchers have suggested they expect the ribbon could change its shape, intensity, composition, and other details over human scales of observation & measurement.
So, should these changes happen (and the changes suggest an intensification of the magnetic field) and a concomitant change happens in the Sun’s solar activity, say going from solar minimum to solar maximum and there is corollation between these changes in the solar cycle and the intensity and other dynamics of the ribbon, it would suggest that the Sun is influenced by the interstellar magnetic field, may receive energy from the interstellar magnetic field and go along way to confirming Alfven’s view of a cellular Universe connected in circuits. It would show that the Sun is not an isolated body in this part of the Milky Way galaxy, but is connected to the rest of the galaxy as every star in the galaxy.
If there was a corollation between ribbon composition and strength and the Sun’s solar cycle of minimum and maximum it would defy all current mainstream explanations of solar behavior and could even challenge the conventional “nuclear furnace” model of the Sun. Present conventional explanation does not envision the solar dynamo being effected or receiving any signal or energy from outside the solar system.
Such corollation as described above would suggest there is in fact a dynamic and structure that connects the interstellar magnetic field to the Sun with energy from the instellar (electro)-magnetic field going to the Sun.
I look forward to the results of the IBEX program in the years ahead.

October 26, 2009 6:25 pm

James F. Evans (14:09:42) :
Also, that doesn’t change the fact that Birkeland did later correctly identify that both positive and negative “corpuscles” were present.
He did no such thing. Stung by the argument that the Sun would build up a strong charge indefinitely if all corpuscles were of the same sign, he tried to rescue his ideas by positing that different streams might have charges of opposite signs. Not a neutral plasma as we understand it today and as Lindemann showed it must be.
even with one free electron and one ion there will be a voltage potential drop between the two (however small that would be).
The electrons and ions would be randomly distributed in space [having a very high temperature] so all these small electric fields would point in random directions and there would no net large-scale electric field which is what the discussion is about.
That does not change the fact that Chapman maintained there was no mixing between the solar wind and Earth’s magnetosphere
The Chapman-Ferraro confinement of the the Earth’s magnetic field to a magnetosphere is the primary mechanism [also today] that maintains the magnetosphere and creates the magnetopause current. This has nothing to do with mixing of the magnetic fields. In fact, when the HMF is pointing northwards, there is basically no mixing [called ‘reconnection’] and yet the magnetosphere is still the. The size of the magnetosphere [the ‘standoff’ distance] is determined by the pressure balance of the solar wind against the Earth’s magnetic field. Magnetic reconnection can, at times of southward field, peel off more magnetic field lines from th Earth’s dipole field and add them to the magnetic field in the magnetospheric tail.
I understand Alfven was dedicated to observation & measurement
Alfven was a theoretical physicist [although he was educated as an engineer]. Although Alfven made many contributions to plasma physics, not everything he expounded have stood the test of time, e.g. his view that the Big Bang was a scientific myth devised to explain creation, or his various ideas about matter-antimatter cellular domains in the Universe, or even his ideas about sunspots.
“However, the acceleration of the fast wind is still not understood and cannot be fully explained by Parker’s theory.”
Note the ‘fast’. There are faster streams embedded in the ambient solar wind, and these require extra heating. There are plenty proposed sources of this heating. A popular one is ‘nanoflares’ caused by magnetic reconnection.
some additional mechanism accelerates the solar wind away from the sun.
As I said, there is additional heating in the ‘fast’ solar wind.
NASA and others have advanced […] this electric field is concentrated in the helio current sheet where the acceleration is most pronounced (electric fields cause charged particle acceleration).
NASA and almost every space physicist are on the same page as I. The HCS is caused by the magnetic field changing polarity across it, and there is no acceleration there.
Dr. Svalgaard claims the magnetic fields cause electric current in space. There is no experimental in situ evidence to support this claim
A fundamental process in the cosmos is magnetic reconnection [not recognized by Electric Universe cult], whereby oppositely magnetic fields are pressed together by movement of the neutral plasma. The changing magnetic field induces [as we have discussed so often] an electric field at the boundary between the opposite polarities, driving an interface current. If the induced field is strong enough, the magnetic field topology at the very interface [called the separatrix] can change and the MHD description breaks down right at the interface which is very thin, typically meters only. The theory of this may be found here: http://www.leif.org/EOS/97JA03528.pdf and a recent experimental in situ verification by the Cluster spacecraft fleet can be found here: http://www.leif.org/EOS/97JA03528.pdf .
The in situ observations fully confirm the theory [as we would have expected]. Of course, NASA and I [for that matter] are not surprised by this vindication of our understanding of how magnetic fields and moving plasma shape our universe and of that magnetic reconnection is the dominant process for transfer of energy across the magnetopause.
It would seem that the in situ measurements demolishes the ruminations of a certain Electric Universe enthusiast, Donald Scott:
” Magnetic reconnection was invented to ‘explain’ away the release of vast amounts of energy from magnetic fields in plasmas by people who could not bring themselves to study EM field theory. Again – gravity does not squirt out energy. Energy is released from magnetic fields when the current CAUSING the field to exist, drops in magnitude. Proponents of ‘magnetic reconnection’ demonstrate their ignorance of electro-magnetic principles by committing several fundamental errors in that regard.”
I’m needlessly maligning your character,
Maligning someones character is despicable in any event.
If there was a correlation between ribbon composition and strength and the Sun’s solar cycle of minimum and maximum
But there is, because the ribbon comes from the Sun, and does not defy anything.

October 26, 2009 6:38 pm

Leif Svalgaard (18:25:38) :
James F. Evans (14:09:42)
a recent experimental in situ verification by the Cluster spacecraft fleet can be found here: http://www.leif.org/EOS/angeo-27-4039-2009.pdf .
I typed the link wrong.
The abstract is here:
Abstract. Using data from the four Cluster spacecraft we study the separatrix regions of magnetic reconnection sites at the dayside magnetopause under conditions when reconnection is occurring in the magnetopause current layer which separates magnetosheath plasma from the hot magnetospheric plasma sheet. We define the separatrix region as the region between the separatrix – the first field line opened by reconnection – and the reconnection jet (outflow region). We analyze eight separatrix region crossings on the magnetospheric side of the magnetopause and present detailed data for two of the events. We show that characteristic widths of the separatrix regions are of the order of ten ion inertial lengths at the magnetopause. Narrow separatrix regions with widths comparable to a few ion inertial lengths are rare. We show that inside the separatrix region there is a density cavity which sometimes has complex internal structure with multiple density dips. Strong electric fields exist inside the separatrix regions and the electric potential drop across the regions can be up to several kV. On the magnetosheath side of the region there is a density gradient with strong field aligned currents. The observed strong electric fields and currents inside
the separatrix region can be important for a local energization of ions and electrons, particularly of ionospheric origin, as well as for magnetosphere-ionosphere coupling.
—————
Let me summarize the salient points: when we have magnetic fields of opposite polarity being pressed together by motions of the neutral plasma, they reconnect. The rapidly changing magnetic field induces strong electric fields in the very narrow boundary. This electric field is important in driving the various explosive phenomena observed [substorms, etc] but is created and only exists in the thin boundary region.

October 26, 2009 7:15 pm

James F. Evans (14:09:42) :
Carla, I suggest it is Dr. Svalgaard who wants to “burn” everybody out, principally myself, so he can cynically say to himself, “I got the last word,”
I actually want you to have the last word, along the lines of: “I see, now I finally understand the modern view of the magnetic universe, sorry it took so long”.

Carla
October 27, 2009 6:41 am

Leif Svalgaard (19:15:35) :
James F. Evans (14:09:42) :
Carla, I suggest it is Dr. Svalgaard who wants to “burn” everybody out, principally myself, so he can cynically say to himself, “I got the last word,”
I actually want you to have the last word, along the lines of: “I see, now I finally understand the modern view of the magnetic universe, sorry it took so long”.
Well, for me it will take a lot longer to grasp this in a workable format. I don’t have 45 +- years under my belt to reference. Like maybe a year and half or so of some random reads, so it will be a while. lol That’s ok, as long as my understanding progesses forward.
Do we know the polarity of the main galactic field?

October 27, 2009 8:40 am

Carla (06:41:43) :
Do we know the polarity of the main galactic field?
The ‘main’ field is somewhat of a misnomer, as there really isn’t any. There seems to be a structure in the local field that varies from place to place, following the spiral arms and reversing between them, e.g. Figure 1 in:
http://www.iop.org/EJ/article/1742-6596/47/1/015/jpconf6_47_015.pdf?request-id=2a53010c-2a71-4cc2-998f-f6f75b128ef0

James F. Evans
October 27, 2009 3:30 pm

Well, let’s see if I can pare this down (it’s gone kinda global, at some fault of my own) to a tailored response.
Dr. Svalgaard presents Evans’ statement: “even with one free electron and one ion there will be a voltage potential drop between the two (however small that would be).”
Dr. Svalgaard responds: “The electrons and ions would be randomly distributed in space [having a very high temperature] so all these small electric fields would point in random directions and there would no net large-scale electric field which is what the discussion is about.”
First, a perfect quasi-neutral region of plasma is not what is observed in the solar system or in the Universe at large.
What is observed & measured is plasma flows where the free electrons and ions are moving in an ordered direction, such as the helio current sheet. That is why NASA and others refer to it as a “current”, which is shorthand for “electric current”, and thus have an ordered magnetic field.
But let’s take Dr. Svalgaard’s hypothetical at face value. If the electrons and ions were randomly distributed due to temperature and randomly moving due to temperature, a magnetic field would not be evident because magnetic fields are dissipated by high temperature because the random movement of electrons and ions tend to cancel out an organized magnetic field.
Essentially, the electric field and the magnetic field would suffer the same fate in the hypothetical presented by Dr. Svalgaard.
But, again, that is not what is observed and measured, instead there is an organized magnetic field, which only results if there is an organized electric current and organized electric field.
Also, space plasmas exhibit ordered movement even in the intense temperature of the Sun. And, there are coresponding electric currents and electric fields, and, thus, magnetic fields.
As NASA states:
“Magnetic fields are produced by electric currents. These currents are generated within the Sun by the flow of the Sun’s hot, ionized gases. We observe a variety of flows on the Sun’s surface and within its interior. Nearly all of these flows may contribute in one way or another to the production of the Sun’s magnetic field.”
http://solarscience.msfc.nasa.gov/dynamo.shtml
So, while Dr.Svalgaard is entitled to postulate any hypothetical he wants, his hypothetical is meaningless, and, therefore, useless in deriving any understanding of space plasma because his hypothetical has no parallel example in space plasma.
Above, it has been mentioned that the helio current sheet and the Sun both have ordered charged particle movement (plasma), and thus, electric current and electric fields. If the highest temperature objects, stars, have electric currents, and, thus, electric fields, Dr. Svalgaard has a hard time pointing to anywhere his hypothetical has real world application.
Now, let’s go back to the statements in context:
Dr. Svalgaard wrote, “…neutral with equal mix of electrons and ions.”
And Evans responded:
“No. this is a confusion of terms. Any region which has ionized electrons and ions (quasi-neutral) there will be electromotive force or an electric field present, even with one free electron and one ion there will be a voltage potential drop between the two (however small that would be).”
And Dr. Svalgaard answered: “The electrons and ions would be randomly distributed in space [having a very high temperature] so all these small electric fields would point in random directions and there would no net large-scale electric field which is what the discussion is about.”
Actually, not only is Dr. Svalgaard’s hypothetical irrelevant because there have been no parallel in space plasma regions observed & measured that match his hypothetical, but his answer takes my statement out of context because I was referring his “confusion of terms.”
Dr. Svalgaard is creating a strawman argument.
My point is still correct: “…neutral with equal mix of electrons and ions.” is a confusion of terms that leads to sloppy analysis.
But let’s take this one step further, magnetic fields are ubiquitous in the Universe: But they have ordered form, everytime they are observed & measured. There are no disordered colonies of magnetic monopoles running around.
We know about the helio current sheet and the Sun.
But this also applies farther afield.
The following link is to an image of the Magnetic fields in the Orion molecular cloud region:
http://www.plasmaresources.com/imagestash/magnetic_fields_in_orion.jpg
Note the “B field” in the image are the magnetic fields and note its directionality due to electric fields and electric current, flowing charged particles, electrons and ions.
The ordered magnetic fields are perpendicular the the flows of plasma.
And here:
“The Orion Molecular Cloud superimposed on the Orion constellation, with the orange star Betelgeuse at the top corner and Rigel at the bottom. The inset shows the Slinky-like coils of the helical magnetic field surrounding the filamentary cloud. (Credit: Saxton, Dame, Hartmann, Thaddeus; NRAO/AUI/NSF) ” (Caption for the following linked image):
http://www.thunderbolts.info/thunderblogs/images/OrionMagneticSlinky.jpg
(superimposed schematics, original)
It’s important to note that Dr. Svalgaard’s hypothetical doesn’t match up with physical observations and measurments. And in fact, the observations & measurements are in line with what I have been arguing: Flows of plasma, electric currents, generate the magnetic fields.
Dr. Svalgaard presents Evans’ statement: “NASA and others have advanced […] this electric field is concentrated in the helio current sheet where the acceleration is most pronounced (electric fields cause charged particle acceleration).”
First, the initial phrase in the quoted passage did not directly relate to the second quoted phrase, so, to put the initial phrase in proper context:
“Structure and morphology is one thing (and is important), but the processes that drive the structure is just as important, and that is where you naively cling to the mechanical model where NASA and others have advanced into a more sophisticated understanding and model that accounts for the electrical and magnetic properties of the solar wind, helio current sheet, and coronal mass ejections, along with their interaction with the Earth’s magnetosphere.”
It is clear Dr. Svalgaard takes the first phrase out of context to suggest I am claiming NASA endorses my view for the physical process that accelerates the solar wind…while that would be nice…I never made such claim.
In the initial statement I was referring to general models: Dr. Svalgaard maintains a mechanical model of “gas”, “kinetics”, and “pressure” of solar sytem dynamics, and NASA supports a “more sophisticated understanding and model that accounts for the electrical and magnetic properties of the solar wind, helio current sheet, and coronal mass ejections, along with their interaction with the Earth’s magnetosphere.”
Which is clearly the case if one reviews the NASA Stargazers website:
http://stargazers.gsfc.nasa.gov/resources/sun_earth_background.htm
And Dr. Svalgaard responds: “NASA and almost every space physicist are on the same page as I. The HCS is caused by the magnetic field changing polarity across it, and there is no acceleration there.”
Dr. Svalgaard offers no authority in support of his statement, as typical he relies on fiat, hoping to have his “say so” be taken at face value, I suggest this particlular example casts doubt on that assumption.
Dr. Svalgaard, now, moves to respond to my challenge for him to present in situ experimental observation that would either falsify or verify his claims regarding magnetic fields causing electric currents.
Dr Svalgaard presents Evans’ statement: “Dr. Svalgaard claims the magnetic fields cause electric current in space. There is no experimental in situ evidence to support this claim”
And Dr. Svalgaard responds: “A fundamental process in the cosmos is magnetic reconnection [not recognized by Electric Universe cult], whereby oppositely magnetic fields are pressed together by movement of the neutral [oxymoron] plasma.”
How come astrophysicists like Dr. Svalgaard always seem to resort to so-called “magnetic reconnection” when they don’t have a ready explanation for a physical process in space?
And in direct contradiction to Dr. Svalgaard’s claim, NASA scientists readily concede they don’t understand the physical processes for “magnetic reconnection”:
“[Magnetic reconnection,] The problem is, researchers can’t explain it.”
NASA goes on:
“Astrophysicists see magnetic reconnection do things] But how? How does the simple act of crisscrossing magnetic field lines trigger such a ferocious explosion?”
And the clincher from NASA:
“Something very interesting and fundamental is going on that we don’t really understand — not from laboratory experiments or from simulations, [and not from in situ experiments]” says Melvyn Goldstein, chief of the Geospace Physics Laboratory at NASA’s Goddard Space Flight Center.”
http://science.nasa.gov/headlines/y2009/31aug_mms.htm
So, while NASA is up front about not understanding it (the collective understanding [or lack thereof] of hundreds of astrophysicists), Dr. Svalgaard claims that he alone understands all about it (sounds vaguely similar to his claim to know the “one physics” prior in this thread).
So, here it is, Dr. Svalgaard claims a process, which NASA in their collective wisdom doesn’t understand, acts to turn around the basic physics of electromagnetism where, as NASA states, electric currents cause magnetic fields.
Sometimes, you just got to shake your head at the guy’s hubris.
Not even Eugene N. Parker went so far as that (he relied on theoretical constructs for his support).
Funny, how Dr. Svalgaard initially claimed that no in situ experiments were necessary to verify his claims, but after getting hammered for such nonsense, he comes up with the tried and true, “oh, yes, good ol’ magnetic reconnection, that’ll do the trick.”
it straines credibility.
I will get to how Dr. Svalgaard handles the hypothesis/prediction. (Hint, the helio current sheet by the time it reaches the heliosphere has no resemblance to the shape of the ribbon, and as stated above the researchers, themselves, and Dr. Svalgaard, too, agreed, the interstellar magnetic field “dominates” the heliosphere and causes the ribbon, not the solar wind or helio current sheet. That’s what was so “revolutionary” about the observations & measurements.)
To be cont.

Carla
October 27, 2009 5:19 pm

Leif Svalgaard (08:40:34) :
Carla (06:41:43) :
Do we know the polarity of the main galactic field?
The ‘main’ field is somewhat of a misnomer, as there really isn’t any. There seems to be a structure in the local field that varies from place to place, following the spiral arms and reversing between them, e.g. Figure 1 in:
Thanks and back at you. Mentions dark fields? 1st one
Galactic and ExtragalacticMagnetic Fields
Rainer Beck
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
http://arxiv.org/PS_cache/arxiv/pdf/0810/0810.2923v4.pdf
PULSAR ROTATION MEASURES AND THE LARGE-SCALE STRUCTURE
OF THE GALACTIC MAGNETIC FIELD
J. L. Han,1 R. N. Manchester,2 A. G. Lyne,3 G. J. Qiao,4 and W. van Straten5
Received 2005 September 22; accepted 2006 January 16
http://www.iop.org/EJ/article/0004-637X/642/2/868/63735.web.pdf?request-id=9f8d02ce-f54b-4336-a590-cd724dedf17f