Parry sunvex and suncave arcs

On October 28 in Czech Republic I and Lukas Kosarek observed Parry arcs. I saw sunvex arc too (you see title photo) and Lukas take photos of Suncave arc. We saw a nice supralateral arc also.

Parry and Lowitz arcs in Czech Republic

On October 20 and 21 I and Roman Manak saw an upper suncave Parry arc. On October 21 I also observed Lowitz arcs too. On photo is nice Parry arc by Roman. My Parry arc and my Lowitz arcs.

Circular circumscribed halo

This high sun picture by Dorothé Trompert was taken in Alice Springs, Australia, on 15 Nov 2005 13:17 LT. The solar height was 75°. Although the halo is almost circular, it is probably not the 22° halo itself. Instead, the strong peak in its intensity near the halo angle and its vivid colours indicates that it is a circumscribed halo. This observation supports my conjecture that in many of the historic reports of widely noticed 22° halos the presence of a bright circumscribed halo contributed to its visibility. This happened, among other cases, with the so-called 'Chernobyl-halo' in 1986 and with Emperor Augustus's halo in 44BC.

Lunar display with Lowitz arcs

Martin Jankovic and Lukas Kosarek from Brno (Czech Rep.) observed nice lunar display with bright parhelia at October 9. On photos was found clear upper and lower components of Lowitz arcs. More photos of this display are here.

Unidentified halo display in Romania

Attila Kosa-Kiss from Salonta, Romania observed on 29th September 2006 a very interesting halo display at a sun elevation of 12°. Unfortunately, there were no photos but there is a sketch. The most probable explanation is the existence of suncave [H] and sunvex [G] Parry arcs, as shown by the simulation from Les Cowley. Other possibilities would be an circular Lowitz arc [F], as seen on the simulation with HALOET (random: 0.5, plates: 0.5, columns: 0.5, parry: 0.5, Lowitz: 4.0, number of rays=150000). On the same day was observed several time in Germany and Czech the upper part of Lowitz arcs. But Romania was influenced by another weather front (with another cirrus clouds) like the middle European area. Further comments and ideas are very welcome!

 

by Claudia Hinz

 

Originally in Halo reports

Tricker arc in Prague

Very rare Tricker anthelic arc was observed in Prague by Stepanka Kosova. Stepanka seen bright anthelion with "small X". This image is stacking of three photos. It is part of nice halo display with Parry arc and 120 parhelia at October 12 2006.

Czechoslovakia Lowitz arcs

This photo show nice circular Lowitz arc. Photo was taken by Michal Nagy from Slovakia at September 29 2006. My photo possible all components of Lowitz arcs was taken in Holesov (Czech rep.) at October 12 2006.