Sunday, 5 April 2020

CaK Full Disk 5th April

I really was surprised when I came to image in CaK light today just how bright the plage was associated with AR12759 compared to the rest of the chromospheric network.  There are no sunspots visible now, maybe a couple of pores are all that remain, but, that is not unexpected at this juvenile phase of cycle 25.  The image was taken with the Skywatcher ED80 stopped down to 60mm, 1.4x barlow, home brew CaK filter and the PGR GH3 U3 916M camera.