by 
Ariel
ANSWERS: 2
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They do happen. I've seen them twice - once while flying over Greenland and once when I was in Alaska. They're basically caused by solar radiation and wind bouncing off/through the upper atmosphere and are simply visible because of the angle of the sun to the Earth at certain times of the year. They appear to move because they are, in fact, moving.
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They are the result of the solar wind interacting with the Earth's magnetosphere. They move because of the turbulence in the magnetosphere. And I've seen them as far south as Montana. http://en.wikipedia.org/wiki/Aurora_(astronomy)
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