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irisation
In meteorology, irisation, a type of photometeor, is multiple mixed iridescent colors caused by sunlight being diffracted in clouds. The colors are often brilliant and mingled together, sometimes similar to mother-of-pearl.〔(PHOTOMETEORS, by Jesús Martínez-Frías )〕 They sometimes appear as bands parallel to the edge of the clouds. Irisation is caused by very uniform water droplets diffracting light (Within 10 degrees from the Sun) and by first order interference effects〔(Color and Light in Nature By David K. Lynch, William Charles Livingston, Page 133 )〕 (Beyond about 10 degrees from the Sun). It can extend up to 40 degrees from the Sun.〔(PHOTOMETEORS, by Jesús Martínez-Frías )〕 Irisation is sometimes seen along the borders of lenticular clouds.〔(Answers.com - Sci-Tech Dictionary:irisation )〕 Irisations are named after the Greek goddess Iris, goddess of rainbows and messenger of Zeus and Hera to the mortals below.〔(The Cloudspotter's Guide By Gavin Pretor-Pinney, Page 233 )〕
Image:Irisation_or_iridescence_in_super-cooled_cloud_-_NOAA.jpg|Irisation or iridescence in super-cooled cloud droplets in cirrocumulus clouds.
Image:Iridescent Cirrus behind Stratocumulus over Warsaw, June 26, 2005.jpg|Irisation in cirrus (or maybe cirrocumulus) clouds behind Stratocumulus (bottom), in the afternoon over Warsaw, Poland.
==See also==
* Cloud iridescence
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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