noun \mag-ˈnē-tə-ˌsfir, -ˈne-\


:  a region of space surrounding a celestial object (as a planet or star) that is dominated by the object's magnetic field so that charged particles are trapped in it
mag·ne·to·spher·ic \-ˌnē-tə-ˈsfir-ik, -ˈsfer-\ adjective

First Known Use of MAGNETOSPHERE



noun    (Concise Encyclopedia)

Region 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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