Didier Favre
Image taken:
Oct. 18, 2010
Br├ętigny sur Orge, France
Here is another image of the current solar activity in H-alpha. This a mosaic of 5 images stacked with the free software Avistack 2. The final focus length is around 2161 mm with my PST. Each element of the final mosaic is a stack of 300 pictures. This is the longest filament I ever seen last 3 years ! Our estimation according the coordinates of the extremes points of the filament is aroung 550 000 km. (See the solar grid).
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