Thursday, August 3, 2017

AR2670 (formerly AR2665) in White Light and H-Alpha

AR2670 continues to decay. The white light image shows the spot and associated plages quite well, but the H-alpha image is rather disappointing, except for the interesting bright ring around the spot (which was faintly visible to the eye, but which imaging and processing brought out more prominently.

White light images were taken with a 90mm MAK and solar filter, H-alpha with a PST-DS. The imager was a Mallincam DS2.3+ . Both H-alpha and white light images are stacks of 100 frames from 200-frame .ser files, stacked and processed in Registax.

White light image

H-alpha image