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Definition of Van allen belt
1. Noun. A belt of charged particles (resulting from cosmic rays) above the Earth trapped by the Earth's magnetic field.
Definition of Van allen belt
1. Noun. 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. ¹
2. Noun. Any of similar areas around another planet. ¹
¹ Source: wiktionary.com