Friday, 12 July 2019

Ex Active Regions in CaK light - 5th July

Calcium light is great for showing these turbulent regions of plage associated with old active regions. This particular one is a cycle 24 active region that formed on the equator way back in early spring, here in mid summer the remnants are clear to see.  Taken with the 100mm Tal100R refractor, 3x barlow, home brew CaK filter and the FLIR Grasshopper 3 IMX174M camera.