22度暈
22度暈是在太陽或月亮周圍形成的22°的暈,由大氣層中懸浮的大量六邊形冰晶折射陽光或月光形成。[1]
穿過60°六邊形冰晶頂角的光線發生偏折,其度數位於22°- 50°之間。不過精確來說平均最小偏折應為21.84°(取決於光的波長,紅光21.54°,藍光22.37°),內部邊緣為紅色,外部為藍色。[2] 一個22度暈可能會一年持續出現100天。[3]
在民間,22度暈被認為是風暴來臨前的徵兆之一。[4]
參見
參考文獻
- 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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