slang, Northern Lights,
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Those lights above the North Pole are called Aurora Borealis. "Aurorae are produced by the collision of charged particles from Earth's magnetosphere, mostly electrons but also protons and heavier particles, with atoms and molecules of Earth's upper atmosphere"
Source(s):
wikipedia.com

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They're the Aurora Borealis. Were they to occur over the South Pole, they'd be the Aurora Australis. They're electromagnetic disturbances in the ionosphere, totally natural.
Source(s):
http://en.wikipedia.org/wiki/Aurora_Borealis

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The lights above the North Pole are called the Aurora Borealis.
Source(s):
http://en.wikipedia.org/wiki/Aurora_Borealis

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This may be a shocker: Northern Light
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Northern Lights
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It is Aurora Borealis, though it can appear in other places beside just the North Pole. You can check it out at http://en.wikipedia.org/wiki/Aurora_(astronomy)
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aurora borealis
Source(s):
http://en.wikipedia.org/wiki/Aurora_Borealis

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Good question. They are called Aurora Borealis or "Northern Lights".

Check out this amazing time-lapse video:
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The Northern Lights (aka Aurora Borealis).

The Geophysical Institute of the University of Alaska has a forecast page, which will tell you when the the lights will be at brightest
http://www.gedds.alaska.edu/AuroraForecast/
Source(s):
http://www.gedds.alaska.edu/AuroraForecast/
http://en.wikipedia.org/wiki/Aurora_Borealis

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Aurora Borealis
Northern lights
Polar Aurora

They have been called many things, but they something else eh..
Source(s):
http://www.phy6.org/Education/aurora.htm

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If you're speaking of the lights in the sky, or Northern Lights, they are called Aurora Borealis.

According to Wikipedia:

"Aurorae are produced by the collision of charged particles from Earth's magnetosphere, mostly electrons but also protons and heavier particles, with atoms and molecules of Earth's upper atmosphere (at altitudes above 80 km (50 miles))...The collisions in the atmosphere electronically excite atoms and molecules in the upper atmosphere. The excitation energy can be lost by light emission or collisions."
Source(s):
http://en.wikipedia.org/wiki/Aurora_Borealis

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