Sunday, 13 May 2018

A Nearly Spotless Sun Towards Solar Minimum - 12th May

As we head towards solar minimum activity on our Sun will get less and less.  Imaging in CaK light is a good way to show up activity that can be difficult to see in white light views.  Three active regions are currently on the suns earthward face, with the largest of these closer to the eastern limb showing a couple of small pores where magnetic field loops break the solar surface.  This image was taken at 393nm in Calcium light with the homebrew CaK filter, 40mm scope at ~f13 with the PGR Chameleon 3 camera and then coloured to mirror the AIA1700 image.