Halo Phenomena
晕现象
In addition to the 22° halo and the sun dogs, a wide variety of other arcs or halo phenomena occur around the sun in cold climates as a result of ice crystals in the air.
除了22°的晕和太阳犬，寒冷气候中围绕太阳还会出现多种其他弧状或晕现象，这是由于空气中存在的冰晶所致。
Photo by Clay S. Turner. Used by permission.
照片由Clay S. Turner拍摄。获许可使用。
| 22° halo
22度晕 | Sundogs (parhelia)
Sundogs (parhelia)（专名或术语） | Other halo phenomena
其他晕现象 |
Atmospheric optics concepts
References
Greenler
Schaaf
索引 大气光学概念 参考文献 Greenler Schaaf
| HyperPhysics***** Light and Vision
HyperPhysics ***** 光与视觉 | R Nave |
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