Category:Iridescent clouds

<nowiki>Nube iridiscente; Nuage iridescent; Irizacija; Iriserande skyer; 彩云; تقزح السحب; Irisierende Wolke; nuvem iridescente; Đám mây ánh kim; ابرهای رنگین‌تاب; 彩雲; 채운; iridescenten oblak; 彩雲; Iriserende skyer; 彩雲; Awan pelangi; Obłoki iryzujące; Райдужні хмари; Cloud iridescence; 彩雲; זוהר עננים; رنګينې ورېځې; väripilvi; cloud iridescence; nuba irizeco; Irizace oblaků; Երփներանգ ամպեր; Optical phenomenon; Hiện tượng tự nhiên khúc xạ tương tự cầu vồng gây ra bởi vùng lân cận chung của Mặt Trời và Mặt Trăng; type de nuage aux couleurs irisées; fenômeno óptico; Nubes iridiscentes; irisação; irisation; Iriserande sky; ענן זהר; ענן זוהר; 祥雲瑞氣; 旺氣; 瑞氣祥雲; 瑞彩祥雲; 彩雲易散; 祥雲瑞彩; 雲彩; 天子氣; 王氣; 五彩祥雲</nowiki>
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Iridescent clouds are composed of very (locally) homogeneous, small droplets. Iridescence occurs most in thin altocumulus or cirrocumulus, often at the beginning of their formation. It is the result of diffraction around droplets, just like in Coronae.

The iridescence pattern is irregular, sometimes following the clouds borders, instead of circular as in corona rings, because the size of droplets slightly varies from one region of cloud to the next.

Polar stratospheric clouds (also called Nacreous clouds) and Noctilucent clouds are distinct from ordinary iridescent clouds. Please see Category:Corona, Category:Polar stratospheric clouds, Category:Noctilucent clouds.

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