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Halos in cirrus clouds: why are classic displays so rare?

机译:卷云中的光环:为什么经典显示器如此稀有?

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Upper tropospheric cirrus clouds consist of hexagonal ice crystals, which geometrical ray-tracing-theory predicts should regularly produce a variety of optical phenomena such as vivid 22 degrees and 46 degrees halos. Yet, cirrus inconsistently generate such optical displays, while a class of more exotic displays are reported, albeit rarely. I review current knowledge of the cirrus cloud microphysical factors that control ice crystal shape, and hence halo/are formation, but also appeal to halo enthusiasts to help investigate the causes of unusually complex, brilliant, or rare optical displays. Currently, a wealth of meteorological information can be tapped from the Internet to help advance our knowledge of the basic meteorological factors leading to these rare events. (c) 2005 Optical Society of America.
机译:对流层上的卷云由六边形的冰晶组成,几何射线追踪理论预测,应定期产生各种光学现象,例如生动的22度和46度光晕。然而,卷云不一致地产生了这种光学显示,尽管据报道有一类更奇特的显示,尽管很少。我回顾了有关控制冰晶形状以及由此产生的光环/形成的卷云微物理因素的最新知识,同时也吸引了光环爱好者来帮助调查异常复杂,明亮或稀有光学显示器的原因。当前,可以从Internet上获取大量的气象信息,以帮助提高我们对导致这些罕见事件的基本气象因素的了解。 (c)2005年美国眼镜学会。

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