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[mag-nee-tuh-sfeer] /mægˈni təˌsfɪər/

noun, Astronomy.
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.
Compare .
such a region of another planet:
Jupiter’s magnetosphere.
the region surrounding a planet, such as the earth, in which the behaviour of charged particles is controlled by the planet’s magnetic field

1959, from magneto- + sphere. So called because in it the magnetic field of the earth plays a dominant role in the motion of particles.
A highly asymmetrical region surrounding the Earth, beginning about 100 km (62 mi) above the surface on the side of the Earth facing the Sun and extending hundreds of thousands of kilometers into space on the opposite side. In this region the Earth’s magnetic field exerts a significant influence on any charged particles that encounter it. The magnetosphere deflects most of the charged particles in the solar wind, but also traps and deflects some of these particles toward the Earth’s magnetic poles, causing magnetic storms and auroras.


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  • Magnetostatics

    [mag-nee-toh-stat-iks] /mægˌni toʊˈstæt ɪks/ noun, (used with a singular verb) 1. the branch of magnetics that deals with magnetic fields that do not vary with time (magnetostatic fields) /mæɡˌniːtəʊˈstætɪks/ noun 1. (functioning as sing) (physics) the study of steady-state magnetic fields

  • Magnetostriction

    [mag-nee-toh-strik-shuh n] /mægˌni toʊˈstrɪk ʃən/ noun, Physics. 1. a change in dimensions exhibited by ferromagnetic materials when subjected to a magnetic field. /mæɡˌniːtəʊˈstrɪkʃən/ noun 1. a change in dimensions of a ferromagnetic material that is subjected to a magnetic field magnetostriction (māg-nē’tō-rĭ-strĭk’shən) The change in shape and density of a substance, especially a ferromagnetic substance, […]

  • Magnetostrictive delay line

    storage, history An early storage device that used tensioned wires of nickel alloy carrying longitudinal waves produced and detected electromagnetically. They had better storage behaviour than mercury delay lines. [H. Epstein and O.B. Stram, “A High Performance Magnetostriction-Sonic Delay Line,” Transactions, Institute of Radio Engineers, Professional Group on Ultrasonic Engineering, 1957, pp. 1-24]. (2002-11-08)

  • Magnetotail

    [mag-nee-tuh-teyl] /mægˈni təˌteɪl/ noun, Astronomy. 1. the narrow and elongated region of the magnetosphere of the earth or of another planet that extends in the direction away from the sun. magnetotail (māg-nē’tō-tāl’) The elongated extension of the Earth’s magnetosphere on the side facing away from the Sun. The magnetotail is shaped by the pressure of […]

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