Diamond dust halos from Kontiolahti snowguns on 1 December 2010
It was cold morning, at lowest the car showed -31 C. I drove to Mustavaara but guns were not on. But at the distance about 10 km away I saw there was swarm at Kontiolahti biathlon stadium so I drove there and got this little display from lake Höytiäinen ice. The ice fog was a bit too thick and Ac was taking over the sky. Temperature at the location was around -25 C.