Unusual halo around sun

Unusual halo around sun

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Credit: PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY

Caption: An unusual halo. A halo is formed when light from the Sun is refracted by tiny hexagonal ice crystals high in the atmosphere. The most common halo is 22 arc-degrees in diameter. Here, several halos coincide, with diameters of approximately 18, 38 and 47 arc-degrees. The exact cause of this unusual halo formation is unknown, but similar observations were made in the USA in 1987. This halo was photographed in Finland on 14 May 1988.

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Keywords: atmospheric effect, climate, effects, halo, halo effect, ice, meteorology, optical effect, refraction, sun, weather

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