Aurora photographed from Abisko, Sweden on 14 Dec. 2012. This time-lapse sequence spans 2 hours at 20x real-time speed.
The aurora appears predominantly green, but with some violet patches. Clouds show up as dark well defined patches, or lit up by the orange lights of the nearby city of Abisko. Red and white lights and occasional ghostly figures are from people walking by during the 15 second exposure used for each frame.
For best viewing, change the quality to 1080p HD and enlarge the video to full-screen if your computer can manage it.