Iridescent altocumulus clouds

Iridescent altocumulus clouds

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Caption: Iridescent altocumulus clouds. When light shines through cloud, it can be refracted to produce an iridescent, multicoloured sky. The iridescence only occurs when sun or moonlight is not directly overhead and the cloud is newly formed. It is a relatively rare phenomena, occurring mostly over mountains in winter. The altocumulus clouds are composed of water droplets and ice crystals. They occur at medium levels between 2000 & 7000 metres.

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Keywords: altocumulus, atmosphere, atmospheric, climate, cloud, cloud types, clouds, condition, corona, diffracted, diffraction, imperfect, iridescence, iridescent, light, medium-level, meteorological, meteorology, partial, refracted, refraction, spectrum, visible, weather

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