Grand sunspot 2192 imaged in CaK on October 24, a spectral band 2.2 angstroms wide, centered at 393.37nm. Other views of this historic active region can be seen here.

October 24, 2014/ a single video frame captured with 90mm Coronado CaK telescope used courtesy Dennis Zywiczynski, PGR Grasshopper Express 6 megapixel camera

© Alan Friedman | all rights reserved