Photo of Aurora Borealis. Images of Aurora Borealis over Jokulsarlon, Iceland
Huge solar storms produce the intense aurora borealis also called Northern Light.
Aurora Borealis occurs between 35 mi and 600 mi above the earth and is caused by high-speed electrons and protons from the sun, channeled toward the polar regions by the earth's magnetic field. These electrically charged particles enter the atmosphere and collide with air molecules (chiefly oxygen and nitrogen), thus exciting them to luminosity; near the 600-mile level, the light may be given off by electrons and protons combining to form hydrogen atoms.
Read more: http://www.answers.com/topic/polar-aurora#ixzz1mKKt7nHu