Alan Friedman
Image taken:
Oct. 12, 2008
my backyard in Buffalo, NY
Normally I image the sun with small refractor telescopes. but today was an unusual warm and steady day for October so I decided to look at the small sunspot group 1005 in my 10" mak/cassegrain - a scope I normally use for high resolution lunar and planetary photography. This image combines observations made at two different wavelengths of visible light - the Ha line at 656nm in the deep red and the CaK line at 395nm in the blue/violet. For reference, the larger sunspot to the left takes up an area on the solar surface a little smaller than the size of the earth.
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