Author Archives

Marko Riikonen

Beginning of diamond dust season

10.11.2008 5 Marko Riikonen

The diamond dust season began in Rovaniemi on the night of 1/2 November with three snow guns running in the ski jump. Here is one of the displays photographed that night. It is noteworthy that the crystals have cavities in…

Displays

5 June odd radius display in Southern Finland

9.6.2008 17 Marko Riikonen

A major pyramidal crystal display was observed on 5 June in Southern Finland. The center of the action was located in Tampere, where the photo above was taken by Jari Luomanen. Several people noticed the display and photographic documentation is…

Historical

What’s missing from Parry’s drawing?

2.6.2008 0 Marko Riikonen

The famous halo drawing by explorers William Edvard Parry and Edward Sabine does not contain all halos they observed. These missing features are described in their account of the display. First, the parhelic circle was complete with anthelion: “r p,…

Displays

An old halo book available

29.5.2008 1 Marko Riikonen

The almost 300 page book of halos, “Mémoire sur Les Halos et les Phénoménes Optiques qui les accompagnent”, by Auguste Bravais, is available for download ( 1 ). The digital copy is given by Google. The book, which is from…

Displays

Halo winter in Rovaniemi

27.5.2008 3 Marko Riikonen

A summary of the halo action from last winter in Rovaniemi is now on-line ( 1 ). Among other things included are plenty of crystal photos from Moilanen arc displays. Perhaps some of you can see there something that I…

Displays

Sun pillar Intensity threshold

27.5.2008 0 Marko Riikonen

Halo displays created with a bright lamp seem to commonly exhibit a distinct intensity treshold at the zenith. This treshold is especially prominent in the photo above, taken on 13 December 2007 in Pälkäne, Finland as well as in Jukka…

Displays

Halo spring in Finland

16.5.2008 3 Marko Riikonen

After several meagre years, the halo spring in Finland has shown signs of revival. Nothing big has been observed, but since the end of April the number of displays with rare halos has been reasonable. 30. April In Turku pyramidal…

Displays

Two diamond dust displays in Finland

14.5.2008 2 Marko Riikonen

Miika Karppinen photographed this display in the town of Kajaani on 8 March this year. Upper sunvex Parry arc and 46° Parry arc are weakly present ( 1 ). The other display occurred on 26 October 2006 in Salla (…

Displays

An unknown halo and other displays by Jukka Ruoskanen

14.4.2008 9 Marko Riikonen

Jukka Ruoskanen has scanned his best halo slides ( 1 ). The material spans from year 1988 to 2005 and includes several displays of interest. Some cases are rather puzzling, like the one shown above, photographed on 23 December 2001.…

Halo information

A halo on Mars and other papers by Gunther Können

5.4.2008 6 Marko Riikonen

Gunther Können, who has produced a decent number of halo papers, has put his works on-line. These are found in the atmospheric optics section of his web page ( 1 ). Among others, there is an article about subsun on…

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Author Archives

Marko Riikonen

Beginning of diamond dust season

5 June odd radius display in Southern Finland

What’s missing from Parry’s drawing?

An old halo book available

Halo winter in Rovaniemi

Sun pillar Intensity threshold

Halo spring in Finland

Two diamond dust displays in Finland

An unknown halo and other displays by Jukka Ruoskanen

A halo on Mars and other papers by Gunther Können

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