PTS 發表於 2014-11-30 18:25:01

2014 Nov 20 - AR12209 is crossing the meridian

As AR12192 is crossing the meridian, it continues to develop and produces many flares.
It has become smaller and difficult to see with the protected naked eye.
The "white light" images are actually taken with the H-alpha filters, but cooled to ambient temperature instead of the normal working temperature at 59C

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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