Monday, 26 December 2016
Boxing Day Sunshine In Calcium Light - 26th December
Boxing day dawned bright and clear, and despite the low sun I was determined to make the most of the day. The sun is devoid of spots at the moment, but, looking in Calcium light at 393nm it was possible to see several small areas of brighter, white plage - these magnetically frothy regions hint at very low levels of activity, maybe, deeper within out star. I was testing out some new technology today too: Firstly the focus assistant in the Genika capture software allowed an empirical measure that the focus was as sharp as the conditions allowed, which, with a north westerly air stream and a low sun wasn't as good as I know is possible with this setup. Secondly the Daystar Interference Eliminator allowed me to easily apply the minimal tilt needed to get rid of Newtons Rings yet retain a sharp focus, this is a piece of equipment that I feel is going to be invaluable in imaging with other setups in the future. This full disk was taken with the 40mm scope at ~500mm focal length with the homebrew CaK filter and the PGR Chameleon 3 camera.
Posted by Mark Townley at Monday, December 26, 2016