http://apod.nasa.gov/apod/image/1109/C404-5244-6082AuroraTakasaka900.jpg
The aurora are caused by geomagnetic storms. During both the spring and fall the aurora are much more impressive than during summer and fall, though the seasonal connection is not understood. The lights are green, because the light given off by oxygen when it is distressed. The aurora occur approximately 100km above ground level, causing them to be visible from space.
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