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北京天空现日晕景观 太阳周围自带“彩虹光环”

5月9日，北京天空出现绝美日晕。七彩光圈将太阳包裹在天空辐散开来，十分震撼。赵晓宇文/摄

据了解，日晕又叫圆虹，是日光通过卷层云时受到冰晶的折射或反射而形成的，云层中冰晶含量越大，光环也就越显著。赵晓宇文/摄


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