Grand sunspot 2192 from October 19-27, imaged in CaK - a spectral band 2.2 angstroms wide, centered at 393.37nm. Other views of this historic active region can be seen here.

October 27, 2014/ 90mm Coronado CaK telescope used courtesy Dennis Zywiczynski, PGR Grasshopper Express 6 megapixel camera

© Alan Friedman | all rights reserved