Blueberry Sun Image - Astro-photographer Alan Friedman

Alan Friedman took this image of the sun from his backyard in Buffalo, New York on May 14, 2013 with a 90mm Coronado CaK telescope and a PGR Grasshopper Express 6 megapixel camera. 

He applied a specific colour of extreme violet light called CaK in this image that makes the sun appear to look intensely blue. Friedman then false colour-inverts the image. 

The process highlights the sun’s surface including texture, bright sunspots, and hot active regions appearing dark. 

CREDIT: Alan Friedman