Tuesday 28 May 2013

ar11757 CaK f20 26th May

ar11757 CaK f20 by Mark Townley
ar11757 CaK f20, a photo by Mark Townley on Flickr.

A slightly shorter focal length here - only 2000mm with the 100mm scope as the seeing was starting to deteriorate a bit. This shows the new active region (well doesn't look very active really!) AR11757. More interestingly on the limb there is a faint halo, similar to the spicule layer in Ha images, however this is the K2 and K3 chromosphere layers. This is something i want to explore further from an imaging perspective.