22度晕
外观
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Moon_22_halo_colorado.jpg/220px-Moon_22_halo_colorado.jpg)
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]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/57/Path_of_rays_in_a_hexagonal_prism.png/150px-Path_of_rays_in_a_hexagonal_prism.png)
穿过60°六边形冰晶顶角的光线发生偏折,其度数位于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]
和22度晕相似的华的成因是小液滴,华比22度晕更小,颜色也更炫烂。[5]
形成
[编辑]天气关系
[编辑]参见
[编辑]参考文献
[编辑]- ^ Pretor-Pinney, Gavin. The Cloud Collector's Handbook. San Francisco, California: Chronicle Books. 2011: 120. ISBN 978-0-8118-7542-4.
- ^ Carl R. Nave. The 22° Halo. Georgia State University. [2007-04-18]. (原始内容存档于2007-04-01).
- ^ Les Cowley. 22° Halo Formation. Atmospheric Optics. [2007-04-15]. (原始内容存档于2021-01-19). (Including excellent illustrations and animations.)
- ^ Harrison, Wayne. Nelson: Ring Around Moon Sign Of Approaching Storm. The Denver Channel (Denver). TheDenverChannel.com. February 1, 2012 [February 4, 2012]. (原始内容存档于2012-02-03).
- ^ Les Cowley. 22° Circular halo. Atmospheric Optics. [2007-04-15]. (原始内容存档于2020-11-30).
外部链接
[编辑]- Halo September 27 2012, from India(页面存档备份,存于互联网档案馆)
- www.paraselene.de - 22° halo Jun 24, 2006(页面存档备份,存于互联网档案馆)
- Timelapse of top portion of a 22° halo(页面存档备份,存于互联网档案馆)
- 22° halo Jul 3, 2011, Cambodia(页面存档备份,存于互联网档案馆)
- 22° solar halo video 14th March 2012, Sydney Australia(页面存档备份,存于互联网档案馆)
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