Thanks Matt, for your input; I hadn't heard of "Revontulet".
Here is one of many images I got last night near the Russian border where it was -22 C and the kp was only 0. Could see the aurora band in the sky but not the colour. Nose got uncomfortable as the internal moisture began to crystalize till I put a scarf over my face.
http://i638.photobucket.com/albums/u...psd981179e.jpg