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A region surrounding a planet, star, or other body, in which the body's magnetic field traps charged particles and dominates their behavior.

mag·ne′to·spher′ic (-sfîr′ĭk, -sfĕr′-) adj.


(Physical Geography) the region surrounding a planet, such as the earth, in which the behaviour of charged particles is controlled by the planet's magnetic field
magnetospheric adj


(mægˈni təˌsfɪər)

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.
2. such a region of another planet.
mag•ne`to•spher′ic (-ˈsfɛr ɪk) adj.


The region near the planet possessing a magnetic field, which determines the motion of the charged particles in this region. Earth, Saturn, Jupiter, Uranus, and Mercury are the solar system planets known to have magnetospheres.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.magnetosphere - the magnetic field of a planetmagnetosphere - 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
magnetic field, magnetic flux, flux - the lines of force surrounding a permanent magnet or a moving charged particle


[mægˈniːtəʊˌsfɪəʳ] Nmagnetosfera f
References in periodicals archive ?
Auroras' lengths probably relate to activity in the magnetosphere, and smaller magnetic waves might energize particles to create the narrower (1-km-wide) curtains.
The exact position of this shock front changed over time: at times of intense solar activity, Saturn's magnetosphere tended to become compressed and so the shock front moved inwards, but at times when the solar wind was weaker, its magnetosphere tended to expand outwards.
In order to investigate the degree to which results from one set of experiments or observations are actually applicable to other environments, researchers in magnetospheric physics, solar physics, and astrophysics consider the significance of findings about particle acceleration in the laboratory, in Earth's magnetosphere, in the solar wind, at the Sun, and beyond in the astrophysical plasma.
Auroras, such as Earth's northern lights, arise when charged particles from space strike a planet's magnetosphere, the bubble-shaped region defined by a planet's magnetic field.
And this fall, the sun's peaking 11-year activity cycle will shower aurora borealis, or northern lights, over the Northern Hemisphere: "Sky Show" provides a great hook to interest students in "solar max" and Earth's magnetosphere.
Terrestrial aurorae are produced when charged particles, known as coronal mass ejections (CMEs), enter Earth's magnetosphere - a region of space formed by the interaction between stellar winds and the planet's magnetic field.
Open Competition: Creating a small spacecraft to study the interaction of waves and particles at the external borders of the Earth's magnetosphere and the solar wind interaction with the magnetosphere (Code MF OCD: "Resonance" (resonance-ICA))
Over the next few days, this solar wind is likely to impact Earth's magnetosphere and possibly cause displays of aurora.
5 ( ANI ): Researchers have been left searching for potential plasma loss mechanisms from Saturn's magnetosphere.
For example, during the 8- to 12V2-day Apollo missions, Earth's magnetosphere provided the astronauts a modicum of protection from space radiation.
After a brief historical review of early ring current studies, 32 papers on the physics and structures of the earth's inner magnetosphere are organized into sections that deal with the sources and losses of plasma and energetic particles in the inner magnetosphere, energetic particle acceleration mechanisms, external driving mechanisms of the inner magnetosphere, observational aspects of inner magnetosphere dynamics, and large-scale modeling efforts of the inner magnetosphere.