The filament has grown longer, with short E-W arms forming a "cross"
AR12423, seems to have become more active and enlarged. The active area on the east arm is definitely developing.
We should expect to see prominence protruding out of the disc in the coming days.
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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發表於 2015-10-1 20:56:36