环天顶弧

环天顶弧(英语:circumzenithal arc或circumzenith arc,缩写:CZA)或称布拉维弧(Bravais' arc),是一种在外观上类似彩虹的光学现象;但它的形成是太阳光从水平方向通过冰晶(一般位于卷云内)后折射而形成,而非雨滴。
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词汇 | Circumzenithal arc |
分类 | 英语词汇 英语翻译词典 |
释义 |
Circumzenithal arc
中文百科
环天顶弧![]() 环天顶弧(英语:circumzenithal arc或circumzenith arc,缩写:CZA)或称布拉维弧(Bravais' arc),是一种在外观上类似彩虹的光学现象;但它的形成是太阳光从水平方向通过冰晶(一般位于卷云内)后折射而形成,而非雨滴。
英语百科
Circumzenithal arc 环天顶弧![]() The circumzenithal arc or circumzenith arc (CZA), also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow, but it belongs to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops. The arc is located at a considerable distance (approximately 46°) above the sun and at most forms a quarter of a circle centered on the zenith. It has been called "a smile in the sky", its first impression being that of an upside-down rainbow. The CZA is one of the brightest and most colorful members of the halo family. Its colors, ranging from violet on top to red at the bottom, are purer than those of a rainbow because there is much less overlap in their formation. |
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