Displays

Two consecutive photos of the 7/8 December display contain reflected Lowitz arcs. The large image above is a stack of these two photos, the small upper image being heavily unsharp masked version of it. Reflected Lowitz arc is marked with…

Here are photos taken towards the lamp. They were taken at the time when blue circle was strong on the opposite side of the sky. The upper ones are single images, exposure times 2 and 15 seconds. The lower images…

These three single photos are from different stages of the 7/8 December display in Rovaniemi. They all show Bouguer’s halo, i.e. fogbow together with halos. But in reality halos and fogbow were seen mainly separately, in swiftly passing ice and…

On the 5th December in Nivala water fog lay still in the air at -7 C temperature. So conditions were perfect for testing the halo gun which sprays water-kaoline mixture to initiate ice nucleation ( 1 ). The spray was…