Sundogs in tundra along a trans-Alaska pipeline, during mid-winter

Konstantinos Kourtidis 12 years, 10 months ago

Apart from the sundogs, a 22 deg halo is also very clear in this mage. Both sundogs (also called parhelia) and the 22 deg halo are caused by minimum deviation of sunlight through the 60 deg prism of ice crystals (in cirrus clouds usually), the former when the crystal plates are oriented horizontally, the latter when they are oriented randomly. So in this picture I would assume you have both randomly oriented and horizontally oriented plates. Nice photo!