46度晕

46度晕是一种很罕见的出现在太阳附近的晕。当太阳与水平线的夹角呈15-27°时，46度晕很容易与上侧弧与外侧弧混淆。[1]

46度晕与22度晕相似，但更宽更淡。成因是阳光穿过六角形冰晶时，[2] 晶体之间90°的夹角使得其色彩分布比22度晕更为分散。[3]

出现于台湾嘉义县的46度晕

参考文献
  1. The 46° halo was first explained as being caused by refractions through ice crystals in 1679 by the French physicist Edmé Mariotte (1620–1684). See: Mariotte, Quatrieme Essay. De la Nature des Couleur (Paris, France: Estienne Michallet, 1681). Sun dogs as well as the 22° and 46° halos are explained in terms of refractions from ice crystals on pages 466 - 524 （页面存档备份，存于）.
  2. . Arbeitskreis Meteore e.V. [2007-04-16]. （原始内容存档于2007-03-31）.
  3. Les Cowley (?). . Atmospheric Optics. [2007-04-16]. （原始内容存档于2019-01-19）. (including an illustration and an animation)

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