Ice Crystal Halos

Odd radius halos in Nydek

Odd radius halos in Nydek

After a year of non-pyramidal halo complexes, finally a pyramidal one appeared. On 10 September, I (Martin Popek) observed 9°, 18°, 20°, 23° and maybe a 24° halo, together with weak 9°, both 18° and 23° parhelion, which was separated from the 23° halo. 50 images were stacked using RegiStax. Notice the bad anomalies which are created by Bishop’s ring ( 12 ).

The phenomena formed in thick cirrostratus clouds before the arrival of a warm front. Some meteorogical data are also provided ( 34 ).

Text: Martin Popek, Matej Grek


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