A flare in Ca-k
Taken by Marco Bruno on September 21, 2013 @
Rivalta di Torino, Italy
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Details:
A picture caught this morning around 0920z in Calcium-K light. Active areas 1850 (left) and 1846 (center). The bright spot in AR1850 is an high intensity UV emission from a flare in progress. It lasted only two minutes; time to recognize it, take a low resolution movie (from wich this picture is processed), install a barlow, refocus... and it was almost gone. I don't know the X-ray flux intensity, since in that moment the GOES-W satellite was in eclipse, so no data. But it was not very strong, probably a B9 or C1
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