Tuesday, 8 May 2018

CaK Full Disk - 6th May

Calcium wavelengths are great for spotting solar activity as it shows up white, and despite a virtually empty disk in whitelight there were 2 active regions easily seen at 393nm.  This shot was taken with the 40mm scope at somewhere near 500mm focal length.  The homebrew CaK filter and the PGR Chameleon were used.