46度暈

46度暈是一種很罕見的出現在太陽附近的暈。當太陽與水平線的夾角呈15-27°時，46度暈很容易與上側弧與下側弧混淆。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 .

46度暈與22度暈相似，但更寬更淡。成因是陽光穿過六角形冰晶時， 晶體之間90°的夾角使得其色彩分佈比22度暈更為分散。 (including an illustration and an animation)

 參考文獻

 外部連結 
 Atmospheric Optics - 46° Radius Halo - including a HaloSim computer simulation and an Antarctica fish eye photo.

Category:大氣光學現象