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標題: 微笑彩虹 [21P] [列印本頁]

作者: goodperson 時間: 2021-4-2 10:20:59 標題: 微笑彩虹 [21P]

微笑彩虹

微笑彩虹就是與通長看到的彩虹上下顛倒，稱作環天頂弧（circumzenithal arc CZA）或稱布拉維弧（Bravais' arc），是一種在外觀上類似彩虹的光學現象；但它的形成是太陽光從水平方向通過冰晶（一般位於卷雲內）後折射而形成，而非雨滴。
較常出現在高緯度國家。

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