AR11575, is much closer to the solar equator than AR11573 in the northern hemisphere. This group is a very active and is led by a large spot that has splitted into 3 with a light bridge. The sunspot is surround by a neat radial set of fibrils, and an outer layer of larger fibrils. To the east are several surginh filaments that go towards a flaring region in the east.
The un-named AR to the NE is also very active. A huge prominence in the form of a thick filament and running in the NE direction separated the two from another active region that has just turned to the front side.
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
發表於 2012-9-21 22:27:09