What is the purpose of the van allen belts?

Earth's two main belts extend from an altitude of about 1,000 to 60,000 kilometers above the surface in which region radiation levels vary. Most of the particles that form the belts are thought to come from solar wind and other particles by cosmic rays.[1] By trapping the solar wind, the magnetic field deflects those energetic particles and protects the Earth's atmosphere from destruction.

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