Kerna Arc

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Kerat Arc - is a very rare atmospheric optical phenomenon caused by flake ice crystals with an almost triangular base.

The phenomenon is very poorly visible and forms a circle around the zenith. This halo coincides with a circular arc in the lower part. The Kerna Arch (first observation by H. F. Kern in 1895) was repeatedly observed in the 20th century, but the first photographs were taken on 17 November 2007 by Marko Mikkilä in Sotkamo, Finland.

The Kerk arch is formed by flake crystals with a base more like a triangle than typical hexagonal ice crystals (see diamond dust). Kerna is caused by light rays entering the upper plane of the crystal and reflected by the lateral plane. The rays come out and are refracted by a second side plane that is at an angle of 60 degrees to the first reflecting plane. Bibliography

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