Sunday 14 May 2017

CaK Full Disk 14th May

The sun is pretty quiet at the moment as we head nearer solar minimum, with no sunspots being visible for the 6th day in a row.  However looking in narrow band light at calcium wavelengths it can be seen that there is a small area of plage that has come over the northeastern limb.  This is likely the decaying remnants of an active region that first appeared on the sun over 3 rotations ago.  With 'less' to see and churn the chromospheric network these decayed cores are quite easy to track.  Taken with the 40mm scope at 400mm focal length with the homebrew CaK filter and the PGR Chameleon 3 camera.