Wednesday, 29 April 2015

CaK Filaproms - 28th April

Filaments and prominences are at best ghostly and tenuous in CaK light, so imagine my surprise when I focused in on the sun with the 40mm OTA at 560mm focal length and saw not just one, but two filaproms visible quite easily on screen.  Just a few hours later, the one in the north east limb lifted off in spectacular style.  Taken with the homebrew CaK filter and the Imaging Source DMK31 camera.