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2015 Sept. 26-27 Sun -9th & 10th day of a huge filament

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發表於 2015-10-1 20:46:22 | 顯示全部樓層 |閱讀模式
SIgnificant changes are visible on the filament, notably the splitting up of the northern part.
Many knobs and barbs are visible in this filament.
AR12423, seems to have become more active and enlarged.  A new active area is also noted to the east of the filament.

On September 27, cloud prevented detail observation but the filament must have undergone big changes.

Telescope: AP Starfire EDT 155 mm f/9.   
stopped to 50 mm for disc images, with 4X telecentric lens (f/36) for closeups   
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter   
Camera: Imperx 4M15   
North is up, and east to the left.
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