2004/10/04 | 极光[Aurora]
类别(¤〖天文〗) | 评论(0) | 阅读(33) | 发表于 10:58
Also called the northern lights (or southern lights in the southern hemisphere). The aurora is a shimmering curtain of green and/or red light seen toward the north (in the northern hemisphere). It results from electronic excitation of oxygen and nitrogen atoms in the upper atmosphere by charged particles trapped in the magnetosphere.
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