On 29 December 2007, Radomir Vondra observed a complex diamond dust display above an inversion cloud layer. He was walking to the ski slope in the village of Dolni Morava, when he saw the halos between 12:30 and 13:00. The elevation of the Sun was about 15 degrees above the horizon, and the dominant phenomena that first appeared were the parhelia and a bright circumzenith arc. Later, after the sky got clearer, a suncave Parry arc appeared above the upper tangent arc. An unsharp masked version of the photo is also available ( 1 ).
Text: Martin Popek, Lukas Shrbeny