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magnetic field

Last Updated: Oct 20, 2014 08:09PM UTC
A region of space around a magnetic material (such as the Earth’s molten core) or a moving electrical charge, within which the magnetic force acts. The path (or direction) of electrically charged particles is affected by the presence of a magnetic field. Charged particles trapped in the Earth’s magnetic field can be accelerated toward the Earth’s magnetic poles along magnetic field lines. These accelerated particles can collide with the Earth’s atmosphere near the magnetic poles to create an aurora.
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