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CIRCUMHORIZONTAL ARC PHENOMENOM

KUALA LUMPUR 05 March 2012. Rare phenomenom called circumhorizontal arc appeared for only 10 minutes at the upper skies at Bangsar, Kuala Lumpur. A circumhorizontal arc is an optical phenomenon, an ice halo formed by plate shaped ice crystals in high level cirrus clouds. The current accepted names are circumhorizon arc or lower symmetric 46° plate arc. The complete halo is a huge, multi-coloured band running parallel to the horizon with its centre beneath the sun. The distance below the sun is twice as far as the common 22-degree halo. Red is the uppermost colour. Often, when the halo-forming cloud is small or patchy, only fragments of the arc are seen. The arc has a considerable angular extent and is thus rarely complete. When only fragments of cirrus cloud are in the appropriate sky/sun position they can appear to shine with spectral colours. NSTP/Chan Wai Yew

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