Ice Crystal Halos

Tampere Ellipse

4.6.2010 2 -

The elliptical halo display observed yesterday by Marko Riikonen and Jari Luomanen was formed – as usual – in Ac virga. Marko had been paying much attention to Ac virgas for some time, and could therefore observe the whole display…

Miscellaneous

Atmospheric optics meeting in Finland

18.5.2010 2 Jari Luomanen

14-16 May saw Finnish atmospheric optics enthusiasts gathering in Finnish Astronomical Association’s (URSA) Artjärvi observation center. The programme for the meeting included presentations on noctilucent cloud observations, halo simulations, chdk-software for compact cameras, diamond dust halo chasing as well as…

Displays

Odd radius display from Kiev

17.5.2010 0 -

Alexandr Shinder made the above panorama of the odd radius display he observed in Kiev, Ukraine on 31 March 2010. Further images can be viewed on his blog ( 1 ).

Displays

Odd radius column arcs from Joensuu

14.5.2010 2 -

Summer’s first hot weather spell started on 12 May in Finland, and along came solitary 23° plate arc. Yesterday it got warmer (+24°C) and also the halos got warmer. Odd radius column arcs! In addition to 9° and 24 column…

Halo information

Simulations on the possible new arc from Moilanen crystals

10.5.2010 6 -

Here are some simulations to follow up with the possible new arc from Moilanen crystals ( 1 ). As suggested by Marko, I did some “photo quality” simulations with the two Moilanen arcs using Jukka Ruoskanen software. The Moilanen crystals…

Displays

Sun pillar from Jersey

3.5.2010 5 -

The phenomena began about 30 minutes before sunrise (which was at 5:58am local time) and faded completely about 30 minutes after sunrise. Apart from the main sun pillar you can see faint pillars to the left of the church and…

Displays

Lowitz arcs on old film photographs

22.4.2010 6 -

Last weekend, I visited my parents in Normandy. I took advantage of my visit to dig through my old astronomy journals of observations and pictures. I was looking for my records of what has been my best halo display. In…

Halo information

An animated stereo simulation of streetlight halos

12.4.2010 2 -

For quite a long time I was wondering how halos in nearby ice crystals, especially when caused by divergent light, are perceived spatially. The AKM halo meeting at the Sudelfeld, Germany in January 2010 has intensified this interest once more,…

Displays

Three days of odd radius in a row

11.4.2010 0 Marko Riikonen

Sometimes odd radius halos come day after another. In April 1987 I observed three consecutive days of odd radius halos and in April 1996 Jarmo Moilanen had four days in a row. On both periods there was also one night…

Displays

High sun parhelic circle

10.4.2010 5 Marko Riikonen

There are not much around photos of parhelic circle that fits inside the 22° halo. Here is one, seen over La Silla astronomical observatory in Chile on 27 January 1990. Sun is at 79 degrees elevation. Damien Hutsemekers, who took…

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Ice Crystal Halos

Odd radius halo – 2 April

Display from Achsheim

Helic and Tape arc in Cirrus

Subanthelion and diffuse subanthelic arcs

Plate Arcs from Japan

Tampere Ellipse

Atmospheric optics meeting in Finland

Odd radius display from Kiev

Odd radius column arcs from Joensuu

Simulations on the possible new arc from Moilanen crystals

Sun pillar from Jersey

Lowitz arcs on old film photographs

An animated stereo simulation of streetlight halos

Three days of odd radius in a row

High sun parhelic circle

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