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]
参考文献
- ^ 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）.
- ^ 46°-halo. Arbeitskreis Meteore e.V. [2007-04-16]. （原始内容存档于2007-03-31）.
- ^ 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)
外部链接
- Atmospheric Optics - 46° Radius Halo（页面存档备份，存于互联网档案馆） - including a HaloSim computer simulation and an Antarctica fish eye photo.