- Latest image of the far side of the Sun based on high resolution STEREO data, taken on February 2, 2011 at 23:56 UT when there was still a small gap between the STEREO Ahead and Behind data. This gap will start to close on February 6, 2011, when the spacecraft achieve 180 degree separation, and will completely close over the next several days. Credit: NASA
Note to WUWT readers, as soon as this new imagery is made regularly available, it will be posted on the WUWT Solar Images and Data Resources Page
From NASA: It’s official: The sun is a sphere.
On Feb. 6th, NASA’s twin STEREO probes moved into position on opposite sides of the sun, and they are now beaming back uninterrupted images of the entire star—front and back.
“For the first time ever, we can watch solar activity in its full 3-dimensional glory,” says Angelos Vourlidas, a member of the STEREO science team at the Naval Research Lab in Washington, DC.
NASA released a ‘first light’ 3D movie on, naturally, Super Bowl Sunday:
| › Download this and more STEREO 360 videos
The solar sphere as observed by STEREO and the Solar Dynamics Observatory on January 31, 2011. Because the STEREO separation was still slightly less than 180o at that time, a narrow gap on the far side of the Sun has been interpolated to simulate the full 360o view. The gap and quality of farside imaging will improve even more in the days and weeks ahead. |
“This is a big moment in solar physics,” says Vourlidas. “STEREO has revealed the sun as it really is–a sphere of hot plasma and intricately woven magnetic fields.”
Each STEREO probe photographs half of the star and beams the images to Earth. Researchers combine the two views to create a sphere. These aren’t just regular pictures, however. STEREO’s telescopes are tuned to four wavelengths of extreme ultraviolet radiation selected to trace key aspects of solar activity such as flares, tsunamis and magnetic filaments. Nothing escapes their attention.
An artist’s concept of STEREO surrounding the sun. Credit: NASA “With data like these, we can fly around the sun to see what’s happening over the horizon—without ever leaving our desks,” says STEREO program scientist Lika Guhathakurta at NASA headquarters. “I expect great advances in theoretical solar physics and space weather forecasting.”
Consider the following: In the past, an active sunspot could emerge on the far side of the sun completely hidden from Earth. Then, the sun’s rotation could turn that region toward our planet, spitting flares and clouds of plasma, with little warning.
“Not anymore,” says Bill Murtagh, a senior forecaster at NOAA’s Space Weather Prediction Center in Boulder, Colorado. “Farside active regions can no longer take us by surprise. Thanks to STEREO, we know they’re coming.”
NOAA is already using 3D STEREO models of CMEs (billion-ton clouds of plasma ejected by the sun) to improve space weather forecasts for airlines, power companies, satellite operators, and other customers. The full sun view should improve those forecasts even more.
| › See STEREO 360 videos
Observing solar storms from two points of view has allowed forecasters to made 3D models of advancing coronal mass ejections (CMEs), improving predictions of Earth impacts. Credit: NOAA/SWPC |
The forecasting benefits aren’t limited to Earth.
“With this nice global model, we can now track solar storms heading toward other planets, too,” points out Guhathakurta. “This is important for NASA missions to Mercury, Mars, asteroids … you name it.”
An artist’s concept of STEREO spacecraft. Credit: NASA NASA has been building toward this moment since Oct. 2006 when the STEREO probes left Earth, split up, and headed for positions on opposite sides of the sun (movie). Feb. 6, 2011, was the date of “opposition”—i.e., when STEREO-A and -B were 180 degrees apart, each looking down on a different hemisphere. NASA’s Earth-orbiting Solar Dynamics Observatory is also monitoring the sun 24/7. Working together, the STEREO-SDO fleet should be able to image the entire globe for the next 8 years.
The new view could reveal connections previously overlooked. For instance, researchers have long suspected that solar activity can “go global,” with eruptions on opposite sides of the sun triggering and feeding off of one another. Now they can actually study the phenomenon. The Great Eruption of August 2010 engulfed about 2/3rd of the stellar surface with dozens of mutually interacting flares, shock waves, and reverberating filaments. Much of the action was hidden from Earth, but plainly visible to the STEREO-SDO fleet.
“There are many fundamental puzzles underlying solar activity,” says Vourlidas. “By monitoring the whole sun, we can find missing pieces.”
Researchers say these first-look whole sun images are just a hint of what’s to come. Movies with even higher resolution and more action will be released in the days and weeks ahead as more data are processed. Stay tuned!
Related Links:
For more information about STEREO, please visit › www.nasa.gov/stereo.
› Download a self-guided Science Briefing explaining this historic “First”.
Dr. Tony Phillips
NASA’s Heliophysics News Team
Here is a good look:
http://stereo-ssc.nascom.nasa.gov/beacon/beacon_secchi.shtml
Hmm, got meself thinking.
We have Hubble looking back in time nearly as far as the Big_Bong, physical probes to in the outer reaches of the solar system and the sun on 24/7 reality TV. BUT we don’t have a single shot of the far side of the Moon, even 40 years after first having a manned flight pass over it.
Now I’m sure the other side must be so amazingly boring to look at and “just the same” as the bit we can see, but all the same it seems like one huge and obvious omission.
It’s a bit like living in a house for 40 years and never bothering to have a look in the cellar.
“John Day says:
February 7, 2011 at 8:19 am”
That is ture only if the entire surface is mapped. Is it?
John Day says
>>
Now its mission has effectively changed from producing 3-D images to producing panoramas of the entire solar surface.
Maybe you owe NASA an apology?
>>
OK, so we’re talking Hollywood red and blue glasses type “3D image”.
Maybe I should not have commented on Angelo’s ” full 3-dimensional glory” from a possibly out of context quote reported here but a comment here is based on what I read here, not on what I may find if I do in depth research on the subject. But ” full 3-dimensional glory” does not mean red and blue glasses.
Maybe whoever wrote this article owes NASA an apology for quoting out of context content.
Trying some new formatting below. Apologies in advance if it gets mangled…
In a few years the two STEREO spacecraft will be 120° away from the earth on opposite sides of the sun, so you will eventually get your wish. This “shiny new SOHO replacement” to which you refer is called SDO, and is about to celebrate its one-year anniversary in orbit.
Don’t forget that there is SDO that provides an earth-based viewpoint, in addition to the two STEREO satellites that are basically at quadrature now, which allows some stereoscopy to be performed.
@Patrick Davis
> That is ture only if the entire surface is mapped. Is it?
In the same sense that we say “a stopped clock is accurate twice a day”, we can say that “the two STEREO spacecraft can map the entire surface of the Sun”.
Unfortunately, that is only true for Feb 2011. The spacecraft are still drifting further from Earth. So a new “gap” will shortly appear that renders the mapping less than 100% again.
Look at the figure at the top of this posting to see how this works.
… or take a look at this “virtually 100%” mapping panorama (before it goes away):
http://stereo-ssc.nascom.nasa.gov/beacon/beacon_secchi.shtml
😐
@P. Solar
> Hmm, got meself thinking….
> … we don’t have a single shot of the far side of the Moon, even 40 years
> after first having a manned flight pass over it.
Surely (that is your real name, right), you know that NASA doesn’t want you to know that the Moon is merely a clever Hollywood prop, engineered to mask all of NASA’s fake lunar missions all these years? The backside is just made of 2×4’s hollowed out to hold up the canvas facade in front. /sarc off
http://en.wikipedia.org/wiki/Potemkin_village
You’re correct, I meant there’s no hi-res shots. It sure would be interesting to see whether they used screws or nails for the 4 x 2 😉
BTW , I don’t believe the landings were fake but there is a lot of detailed evidence suggesting most of the photos from the first mission were done before they left. Probably so as not to loose the propaganda coup if something went wrong.
/OT
All around Sun´s atmosphere…The wider the sight hopefully will be the wider the understanding.
So if it’s a sphere; why isn’t it it 100 million Kelvins or is it 10 at the center. I just see blackness.
Even if the spectral peak was at 100 pm for 30megK; the output at visible wavelengths would still be way brighter than the surface; so it should look white, instead of black.
They need to fix up that smearing at the limb.
If the sun was the size of a two story building (7m), the part directly radiating towards earth is about the size of this period. Granted there might be some coronal emission that goes off askew, but space is very big (homage to D. Adams). Very little affects this mostly harmless place, though the effect is substantial.
I wish they worried more about resolution on this small section of the sun than on far side of the sun.
Mr. Random Thesis, let me correct a misconception, under which you (and others here) are apparently laboring: the Sun (unlike the Moon) does _not_ continually offer the same face towards the Earth. It rotates on its axis once every 27 days, so we have always been able to “peek” at the far side by just waiting for 2 weeks, when the “far side” rotates into Earth view.
The contribution of STEREO is that now we don’t have to wait two weeks to do the peeking. So we can see short-term events we might have missed before, and also we can more accurately track the longer-lived regions, after they rotate out of Earth view.
Hope that helps.
P. Solar says:
February 7, 2011 at 8:10 am
….. Ever wondered why we now have the Sun, at 93 million miles away, in Panorama-Technicolor but still can’t see the back of the Moon? …..
Au contraire per Wiki.
http://en.wikipedia.org/wiki/Far_side_of_the_Moon
“The far side of the Moon is the lunar hemisphere that is permanently turned away from the Earth. The far hemisphere was first photographed by the Soviet Luna 3 probe in 1959, and was first directly observed by human eyes when the Apollo 8 mission orbited the Moon in 1968. The rugged terrain is distinguished by a multitude of crater impacts, as well as relatively few lunar maria. It includes the second largest known impact feature in the Solar System, the South Pole-Aitken basin. The far side has been suggested as a potential location for a large radio telescope, as it would be shielded from possible radio interference from Earth. To date, there has been no ground exploration of the far side of the Moon. ”
(Photo at the site of about 3/4 of the back-side.)
Well, there’s a relief. Really would have upset some stuff if the sun was flat. So that that, flat-suners!
Great, now we just need to send a rover there to search for water! 🙂
wait! the sun is to hot! The water will boil…
No problem, we go there at night (portuguese way)
“”””” RandomThesis says:
February 7, 2011 at 11:14 am
If the sun was the size of a two story building (7m), the part directly radiating towards earth is about the size of this period. Granted there might be some coronal emission that goes off askew, but space is very big (homage to D. Adams). “””””
Well so how is it that we see the whole sun disk all the time, if only the period (.) is sending light to the earth. I’m sure there is no point on the side of the sun facing earth, that is not sending light towards the earth.
“”””” Leif Svalgaard says:
February 7, 2011 at 8:23 am
Here is a good look:
http://stereo-ssc.nascom.nasa.gov/beacon/beacon_secchi.shtml “””””
Very cool Leif, I taught myself to view stereo images barefoot, years ago, when SciAm used to publish stereopairs of complex molecules.
So you can tell when you have the stereo image because instead of saying Ahead or Behind, it says Behead.
Very nice.
We have nothing to sphere but sphere itself.