Wednesday, 26 March 2008
Two halo days in the northern part of the Czech Republic
Patrik Trncak took a series of photos of the display. The most uncommon halos that he observed were the Wegener arc, which crossed the parhelic circle; and the Tricker arc, which was noticed afterwards on the images processed by Registax ( 1 ).
The next day, the situation was similar, but the Wegener arc was brighter and the cirrostratus clouds lasted for a shorter period ( 2 ).
I (Martin Popek) didn’t have such good luck but I could also observe some interesting halos. On the first day, a nice suncave Parry arc was visible, which shows well on the stacked images. By the bright parhelia, Lowitz arcs appeared, and after a long period of time I saw an infralateral arc, as well ( 3 - 4 ).
On the second day, the halos were less numerous. There was only one that is not so frequent: a faint 46° halo ( 5 ). Later I observed an interesting lunar display, too, including a diffuse 9° halo ( 6 - 7 ).
Text: Martin Popek, Lukas Shrbeny