120度幻日

120度幻日是一種很少見的暈，常伴隨特別明亮的幻日出現，當時的大氣層的卷雲中會充滿冰晶。得名自現象發生時幻日周圍成對的±120°幻日環。 (including a HaloSim simulation.)

120度幻日是光線六角形冰晶上經過至少兩次反射的產物，會在幻日環上形成明亮的藍白色光點。實際上因為會和雲相混淆，所以其可觀測到的顏色十分模糊。

 参考文献 

 外部連結 

 A photo of a 120° parhelion in the Czech Republic in October 2006
 A photo by Joni Tornambe, 2006
 A video from Russia featuring both 120° parhelia, as well as the classic sundogs and parhelic circle, 2007
 A similar video from Kazakhstan with very bright 120° parhelia, 2007

Category:大氣光學現象