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Van Allen belt Tweet Definition of Van Allen belt Like Definition of Van Allen belt on Facebook
noun van, Van Allen belt
  1. Either of two torus-shaped areas of high-energy charged particles which partly surround Earth, trapped by its magnetic field. The areas are characterised by intense radiation. When the belts "overload", particles strike the upper atmosphere and fluoresce, causing the polar aurora.
  2. Any of similar areas around another planet.
Translations: 
    Etymology: From James Alfred Van Allen, US physicist.

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