Hinode X-ray telescope 2019 Calendar: Sun, Sun and Sun

Merry Christmas,


HT and thanks/Willie Soon

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December 25, 2018 6:17 am

Hinode’s close call with Santa?

Based on a highly accurate back of the envelope calculation, Santa is larger than the planet Earth. Quelle surprise!

December 25, 2018 6:38 am
another fred
December 25, 2018 7:15 am


Thanks, and Merry Christmas, Happy Holidays, and/or whatever else is appropriate and non-offensive to you.

Bryan A
Reply to  another fred
December 25, 2018 9:23 am

Happy Festivus

Crispin in Waterloo
December 25, 2018 7:49 am

Have a radiantly happy day!

Tasfay Martinov
December 25, 2018 8:03 am

The energy range of X-ray photons detected in solar X-ray imaging is 2-80 keV, according to Skyandtelescope:


Does anyone know if this solar X-ray imaging is done using a optically scintillator-coupled ccd, or a flat panel (Cmos) camera? These are the two most commonly used X-ray cameras for laboratory systems over this photon energy range.

CCD based X-ray cameras have the better spatial resolution and good sensitivity up to about 30-40 keV. But flat panels have a thicker scintillator and wider energy window, and are better for photons from 30-80 keV.

Joel O'Bryan
Reply to  Tasfay Martinov
December 25, 2018 10:18 am

NASA’s HDO carries two Extreme UV Variability Experiment instruments (collectively called: EVE) instruments that collect data in the soft X-Ray spectrum:

-ESP and
Different, complementary technologies.
MEGS-SAM employs a pinhole camera used with MEGS-A CCD to measure individual X-ray photons in the 0.1 nm to 7 nm range.
ESP uses 9 Si photodiodes behind a transmission grating, with 4, 5, 6, 7 diodes in the soft X-Ray spectrum 0.1-5.9 nm bandpass.

NOAA’s newest GOES-R (GOES-16/17) has 1 instrument for soft X-Ray data collection,the Extreme Ultraviolet and X-ray Irradiance Sensors (EXIS).

Tasfay Martinov
Reply to  Tasfay Martinov
December 25, 2018 2:27 pm

Thanks. I guess that flux is no problem so a pin-hole makes sense. Also I presume those X-ray detectors are energy-discriminating?

December 25, 2018 12:09 pm

Occasionally when I get bored I go on google earth and look for interesting features far away from any human habitations or at the ocean floor.
Recently I got puzzled by this one
Easy to find with the location’s (coincidentally) square coordinates. The outer circle is 7 miles diameter, while the inner circle is 5 miles, no significant elevation difference, so may not be of volcanic origin. Geologically appears to be created ‘recently’and doesn’t appear to be man made since the nearest 2 roads are at 400 and 380 miles away.
Could any passing geologist explain? Unless there is an obvious explanation, I would favour a ‘Tunguska’ type meteorite atmospheric explosion.

Reply to  vukcevic
December 25, 2018 12:22 pm

To judge from the other circular features nearby indicating vulcanism, a heavily eroded volcano.

The lakes are also striking…

Reply to  vukcevic
December 25, 2018 12:33 pm

Also there could be, slightly off centre, an innermost circle with a two mile diameter.

December 25, 2018 2:23 pm

Wikipedia says it is an impact crater, much eroded, less than 345 m.y. old, and that there are others nearby –
Space shuttle has looked at it


Reply to  mothcatcher
December 25, 2018 3:22 pm

Thanks, interesting…

Reply to  mothcatcher
December 26, 2018 1:41 am

Thanks, Wiki’s article radar photo shows clearly the innermost circle.

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