Friday, 29 August 2014

AR12146 Departing In CaK Light 28th August

AR12146 shows the Wilson effect quite well in this shot, the foreshortening a sunspot takes as it nears the limb.  Not only this but also a nice prominence also visible as are hints of the filaments in and around this active region.  The image was taken with the 100mm TAL refractor stopped down to 80mm using a homebrew CaK filter and an Imaging Source DMK31 camera.