46度晕是一种很罕见的出现在太阳附近的。当太阳与水平线的夹角呈15-27°时,46度晕很容易与上侧弧外侧弧混淆。[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,存于互联网档案馆).
  2. ^ 46°-halo. Arbeitskreis Meteore e.V. [2007-04-16]. (原始内容存档于2007-03-31). 
  3. ^ Les Cowley (?). 46° Halo Formation. 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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