I took a close up view of AR12813 in CaK, this active region is slowly but surely decaying away as it approaches the suns western limb, but it has had some activity over the last several days. Taken with the 100mm at f46 using the homebrew CaK filter and the PGR Grasshopper IMX174 camera.
Wednesday 7 April 2021
AR12813 in CaK 6th April
I took a close up view of AR12813 in CaK, this active region is slowly but surely decaying away as it approaches the suns western limb, but it has had some activity over the last several days. Taken with the 100mm at f46 using the homebrew CaK filter and the PGR Grasshopper IMX174 camera.