The sun recorded at the Ca-K line of the spectrum (393.4nm in the near UV) on April 12, 2015. A higher magnification view of Active Region 2321 rotating into view at upper left can be seen here.

April 12, 2015 / 90mm Coronado CaK telescope used courtesy Dennis Zywiczynski, PGR Grasshopper Express 6 megapixel camera

© Alan Friedman | all rights reserved