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magnetosphere |
Also found in: Wikipedia, Hutchinson | 0.06 sec. |
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magnetosphere: see Van Allen radiation belts Van Allen radiation belts, two belts (sometimes considered as a single belt of varying intensity) of radiation outside the earth's atmosphere, extending from c.400 to c.40,000 mi (c.650–c.65,000 km) above the earth. ..... Click the link for more information. . magnetosphereRegion around a planet (such as Earth) or a natural satellite that possesses a magnetic field (see geomagnetic field) where magnetic phenomena and the high atmospheric conductivity caused by ionization strongly influence the behaviour of charged particles (see electric charge). A planet or moon's magnetic field, like its gravitational field, becomes weaker with distance from the body. The solar wind sweeps a body's magnetosphere out away from the Sun in a “tail” trailing well beyond it. |
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| 8, 1990, Galileo overtook Earth and plunged deep into its magnetic tail to capture a brief but tantalizing glimpse of a rarely visited region of the planet's The small satellites will be put in carefully coordinated orbits, and every four days they will line up along the Earth's magnetic tail, allowing them to track disturbances. Hiten precedes a mission planned for 1992, in which a NASA Delta rocket will launch a Japanese spacecraft, called Geotail, into an Earth orbit that carries it beyond the moon and periodically through Earth's magnetic tail -- the region pushed away from the sun by solar winds. |
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Magnetic tail
