Sunday 21 April 2019

CaK Full Disk 21st April

There are 2 very small regions of plage approaching the solar limb but like in Ha the sun is essentially blank, typical of solar minimum.  Taken with the ED60 stopped down to 40mm aperture with the homebrew CaK filter, a 2x cemax barlow and the FLIR GH3 ICX814 camera.