magnetosphere

n. magnetic field that surrounds a planet

A magnetosphere is the region around an astronomical object in which phenomena are dominated or organized by its magnetic field. Earth is surrounded by a magnetosphere, as are the magnetized planets Jupiter, Saturn, Uranus and Neptune. Mercury and Jupiter's moon Ganymede are magnetized, but too weakly to trap plasma. Mars has patchy surface magnetization. The term "magnetosphere" has also been used to describe regions dominated by the magnetic fields of celestial objects, e.g. pulsar magnetospheres.
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Noun
1. the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field
(hypernym) magnetic field, magnetic flux, flux

A region of magnetic field around a planet which traps moving charged particles from the solar wind.

magnetosphere
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