Subsun Over Bow River
February 15, 2007
November 2, 2006 was a frosty but clear morning in western Canada. A few minutes after take-off from Calgary, Alberta, this spectacular subsun was visible over the Bow River, east of Calgary. The brightness was such that it basically washed out any colour from the photo. It was formed by the reflection of sunlight off of oriented, plate-shaped ice crystals. In order to produce such an unusually clear, sharp and bright display, these crystals must have been very well aligned. In the background is the Bow River showing meanders, oxbows and a wide flood plain.