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Circumhorizontal Arc on June 6th, 2015

Circumhorizontal Arcs are rare summer guests in Middle Europe because they need a solar elevation of 58° or more for the observer. The appear a couple of hours around noon the weather permitting. Like their common and in Middle Europa often very colorful and bright counterpart, the circumzenital arc, they are formed by refraction in tiny ice crystals in cirrus clouds.


Fragment of a circumhorizontal arc on June 28th, 2015. Leica M 240, Summilux-M 1:1.4/50 ASPH., 1/4000 sec at f/6.8 and 200 ISO.

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