In Czech mountains Ivo Bartos observed diamond dust halos on December 23, 2007 near ski area of Paprsek, which is situated in the highest Moravian mountains.
From 2 to 5 pm he most of the time observed sun pillar and parhelia with fragments of 22° halo. Culmination of the phenomenon occured at 4 pm when Moilanen arc appeared. This is the fourth observation of this arc in the Czech Republic.
The second case was by Milan Martinek in Bozi Dar in February 2004, who, besides Moilanen arc, observed also upper sunvex Parry arc heliac arc and maybe Lowitz reflected arcs. The photos of the heliac arc were the first in Czech Republic. The third Moilanen arc was observed together with bright upper tangent arc by Emil Brezina on January 1, 2006 in Vsetin.
Text: Martin Popek, Lukas Shrbeny