Polar aurorae are optical phenomena characterized by colorful displays of light in the night sky. An auroral display in the Northern Hemisphere is called the aurora borealis, or the northern lights....
Auroras are the most visible effect of the solar wind upon the Earth's atmosphere. The aurora occur when the Van Allen radiation belts become "overloaded" with energetic particles, which cascade down magnetic field lines and collide with the earth's upper atmosphere....
Sounding too technical?? Why don't you Check Out these cool pictures, courtesy KTJ..
Awesome pictures.
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Michael