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A green Aurora Borealis shimmers over snow-covered Alaskan fields.
Caption:
An aurora is caused by interactions between charged particles in solar winds and atoms in the Earth’s ionosphere, and shaped by the Earth’s magnetic field. It produces its own magnetic fluctuations and electrical currents. (Image courtesy of the U.S. Air Force.)
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| As Taught In: | Fall 2005 |
| Level: |
Graduate
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