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The Collaborative International Dictionary
magnetosphere

magnetosphere \mag*net"o*sphere\, n. 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.

Douglas Harper's Etymology Dictionary
magnetosphere

1959, from magneto- + sphere. So called because in it the magnetic field of the earth plays a dominant role in the motion of particles.

Wiktionary
magnetosphere

n. (context physics English) The comet-shaped region around Earth or another planet in which charged particles are trapped or deflected. Shaped by the solar wind and the planet's magnetic field.

WordNet
magnetosphere

n. 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

Wikipedia
Magnetosphere

A magnetosphere is the region of space surrounding an astronomical object in which charged particles are controlled by that object's magnetic field. The magnetic field near the surface of many astronomical objects resembles that of a dipole. The field lines farther away from the surface can be significantly distorted by the flow of electrically conducting plasma emitted from a nearby star (e.g. the solar wind from the Sun).

Usage examples of "magnetosphere".

The wind produced by the Galilean moons erupts from the Jovian magnetosphere at velocities exceeding those of even the prevailing solars.

Every time the planet runs into one we get problems, as the Earth and its magnetosphere are battered by high-energy particles.

But when it encounters something as dense as a solar magnetosphere the disruption can be detected.

Jupiter will still be in good shape, though, and the Jovian magnetosphere has enough dikes to dampen out the worse of any particle floods the enemy might throw their way.

The survival of Pioneer 10 and 11 through the Jovian magnetosphere was more the result of good luck and good engineering than of the accuracy of pre-Pioneer magnetospheric theories.

Jovian magnetosphere and radio emissions that we still do not understand.

Now what about that little problem I set you on magnetosphere induction generators, hey, have you solved that yet?

The magnetosphere deflects most of the solar wind particles from reaching a planet.

It was necessary to employ relay satellites, but for a week now Saturn had interfered, drowning out with the tail of its stormy magnetosphere all emissions except lasers.

A nuclear imaging instrument of astronomic range placed the planet within a bowl of magnetic fields of flux density equal, at the peaks of the pulse, to the magnetosphere of a micropulsar.

Anything potent enough to put on such a show could well blow away the magnetosphere, the magnetic zone high above the Earth that normally protects us from ultraviolet rays and other cosmic assaults.

Without the magnetosphere anyone unfortunate enough to step into sunlight would pretty quickly take on the appearance of, let us say, an overcooked pizza.

Jupiter had a powerful magnetosphere, a radiation belt of electrons and ions locked to the giant planet, within which Io circled.

Both the planet and its larger moons possess strong magnetospheres and produce plasma winds of their own.

The tidal-locked Ly-cilph world coasted along seventy thousand kilometres above the tenuous outer fringes of the magnetosphere, beyond the reach of the worst radiation.