46度暈

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46度暈是一種很罕見的出現在太陽附近的。當太陽與水平線的夾角呈15-27°時,46度暈很容易與上側弧外側弧混淆。[1]

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,[2] 晶體之間90°的夾角使得其色彩分佈比22度暈更為分散。[3]

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參考文獻[编辑]

  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.
  2. ^ 46°-halo. Arbeitskreis Meteore e.V. [2007-04-16](原始内容存档于31 March 2007). 
  3. ^ Les Cowley (?). 46° Halo Formation. Atmospheric Optics. [2007-04-16].  (including an illustration and an animation)

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