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。[1]
幻日之畫中的120度幻日
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。[2]
参考文献
外部連結
- A photo of a 120° parhelion in the Czech Republic in October 2006（页面存档备份，存于）
- A photo by Joni Tornambe, 2006（页面存档备份，存于）
- 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）
- A similar video from Kazakhstan with very bright 120° parhelia, 2007（页面存档备份，存于）
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