The sun imaged in the wavelength of CaK, a spectral band 2.2 angstroms wide, centered at 393.37nm. The edge prominences are captured in hydrogen alpha, added here to create this solar composite.

A comparison of the full disk image in Ha light can be seen here... and a closeup.

July 14, 2013/ captured with 90mm Coronado CaK telescope used courtesy Dennis Zywiczynski, and Little Big Man, PGR Grasshopper Express 6 megapixel camera

© Alan Friedman | all rights reserved