rjxie 发表于 2003-9-10 11:53

[酷图] 云端上的极光。

Aurora Over Clouds
Credit & Copyright: Dominic Cantin
Explanation: Aurorae usually occur high above the clouds. The auroral glow is created when fast-moving particles ejected from the Sun impact air molecules high in the Earth's atmosphere. An oxygen molecule, for example, will glow in a green light when reacquiring an electron lost during a collision with a solar particle. The lowest part of an aurora will typically occur at 100 kilometers up, while most clouds usually exist only below about 10 kilometers. The relative heights of clouds and auroras are shown clearly in the above picture taken last month from near Quebec City, Canada. The most likely time to see an aurora is around midnight.

meteorobs 发表于 2003-9-10 15:59

呵呵。。

我在背景中看到了英仙和仙后（中上）。。。

easy2003 发表于 2003-9-23 15:55

这是你拍到的吗？

这是在哪里拍的啊，头一次看到这样的景观

ak49 发表于 2003-9-23 16:07

last month from near Quebec City, Canada.

禁止心跳 发表于 2003-10-4 20:20

太好了~!

我好喜欢~!:)

戈比 发表于 2003-10-12 11:44

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