Sundog behind camp on ice stream, Antarctica.

Sundog behind camp on ice stream, Antarctica.

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Credit: DAVID VAUGHAN/SCIENCE PHOTO LIBRARY

Caption: Sundog photographed on the Rutford Ice Stream, Antarctica. Technically known as parhelia, sundogs are points of brightness on one or both sides of the setting sun. They are caused by the refraction of sunlight by ice crystals in the air. A sundog may take on spectral colouring - like a rainbow - because of the way the sunlight refracts through the ice crystals.

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Keywords: antarctica, atmospheric effect, climate, effects, meteorology, parhelia, sun, sundog, weather

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