22度晕
22度晕是在太阳或月亮周围形成的22°的晕,由大气层中悬浮的大量六边形冰晶折射阳光或月光形成。[1]

在最佳角度穿过六角形棱镜的光线通路

月亮周围的22度晕
穿过60°六边形冰晶顶角的光线发生偏折,其度数字于22°- 50°之间。不过精确来说平均最小偏折应为21.84°(取决于光的波长,红光21.54°,蓝光22.37°),内部边缘为红色,外部为蓝色。[2] 一年中可能会有100天可以观测到22度晕,远比彩虹来的频繁。[3]
在民间,22度晕被认为是风暴来临前的征兆之一。[4]
参考文献
- Pretor-Pinney, Gavin. . San Francisco, California: Chronicle Books. 2011: 120. ISBN 978-0-8118-7542-4.
- Carl R. Nave. . Georgia State University. [2007-04-18]. (原始内容存档于2007-04-01).
- Les Cowley. . Atmospheric Optics. [2007-04-15]. (原始内容存档于2021-01-19). (Including excellent illustrations and animations.)
- Harrison, Wayne. . The Denver Channel (Denver). TheDenverChannel.com. February 1, 2012 [February 4, 2012]. (原始内容存档于2012-02-03).
- Les Cowley. . Atmospheric Optics. [2007-04-15]. (原始内容存档于2020-11-30).
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