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Meaning of magnetosphere

mag•ne•to•sphere

Pronunciation: (mag-nē'tu-sfēr"), [key]
— n. Astron.
  1. the outer region of the earth's ionosphere, where the earth's magnetic field controls the motion of charged particles, as in the Van Allen belts. Cf.
  2. such a region of another planet: Jupiter's magnetosphere.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
magnetosheath magnetostatics