Aurora Borealis in Alaska

Aurora Borealis in Alaska

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Caption: Aurora Borealis over the Trans-Alaska Pipeline in Northern Alaska. The Aurora Borealis (northern lights) is an atmospheric phenomenon that occurs at high latitudes, appearing as shimmering bands of coloured light in the sky. It occurs when charged particles in the solar wind are directed towards the poles by Earth's magnetic field. There they collide with atoms in the upper atmosphere, causing them to emit light. The colour of the light depends on the atmospheric gas involved. Green is produced by excited atomic oxygen. Photographed in the Brooks Range, Northern Alaska.

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Keywords: alaska, astronomical, astronomy, atmospheric phenomenon, atoms, aurora borealis, aurorae, auroral, band, bands, brooks range, earth science, earth's atmosphere, effects, electromagnetic effect, gas, glow, green, home, ionised, ionising, light, magnetic, molecules, mountain natural, mountaion, night sky, north america, north american, northern lights, oxygen, particles, physical, physics, pipeline, plant, polar regions, sciences, sky, skyline, trans-alaska

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