120度幻日
120度幻日是一种很少见的晕,常伴随特别明亮的幻日出现,当时的大气层的卷云中会充满冰晶。得名自现象发生时幻日周围成对的±120°幻日环。[1]
120度幻日是光线六角形冰晶上经过至少两次反射的产物,会在幻日环上形成明亮的蓝白色光点。实际上因为会和云相混淆,所以其可观测到的颜色十分模糊。[2]
参考文献
编辑- ^ 120° Parhelia. www.paraselene.de. [2009-03-08]. (原始内容存档于2011-07-19). (including a HaloSim simulation.)
- ^ Les Cowley (?). 120° Parhelia. Atmospheric Optics. [2007-04-15]. (原始内容存档于2007-04-30).
外部链接
编辑- A photo of a 120° parhelion in the Czech Republic in October 2006(页面存档备份,存于互联网档案馆)
- A photo by Joni Tornambe, 2006(页面存档备份,存于互联网档案馆)
- A video from Russia featuring both 120° parhelia, as well as the classic sundogs and parhelic circle, 2007(页面存档备份,存于互联网档案馆)
- A similar video from Kazakhstan with very bright 120° parhelia, 2007(页面存档备份,存于互联网档案馆)