magnetosphere


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magnetosphere:

see Van Allen radiation beltsVan Allen radiation belts,
belts 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. The existence of two belts, sometimes considered as a single belt of varying intensity, was confirmed from information
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Earth's magnetosphere and magnetic field lines, shaped by the solar windclick for a larger image
Earth's magnetosphere and magnetic field lines, shaped by the solar wind

magnetosphere

(mag-nee -tŏ-sfeer) A region of space surrounding a planet within which charged particles are controlled by the magnetic field of the planet rather than by the Sun's magnetic field, which is carried by the solar wind (see interplanetary medium). The solar wind is the source of most of the charged particles, which form a tenuous gas known as a plasma. The region of a planet's magnetosphere is delimited by a boundary called the magnetopause and includes any radiation belts of the planet, such as the Van Allen belts of the Earth. The Earth's magnetosphere extends to 60 000 km on the sunward side of the planet but is drawn out by the solar wind into an elongated extension called a magnetotail stretching many times this distance on the side away from the Sun (see illustration). Magnetic reconnection of the magnetic field lines of the Sun and Earth occurs across the sunward surface of the magnetopause (at points where two lines are in opposing directions); reconnection allows energy and particles to be transferred to the magnetosphere from the solar wind. Above the magnetopause is a layer of turbulent magnetic field, the magnetosheath, enclosed by a shock wave where the smooth flow of solar-wind particles past the planet is first interrupted. Mercury, Jupiter, Saturn, Uranus, and Neptune are also known to possess magnetospheres. See also geospace.

magnetosphere

[mag‚′nēd·ə‚sfir]
(geophysics)
The region of the earth in which the geomagnetic field plays a dominant part in controlling the physical processes that take place; it is usually considered to begin at an altitude of about 60 miles (100 kilometers) and to extend outward to a distant boundary that marks the beginning of interplanetary space.

magnetosphere

magnetosphere
The magnetron produces oscillation because of the influence of a magnetic field on motion of electrons.
The upper part of the thermosphere where the earth's magnetic field plays a more important role in controlling the behavior of protons. Also called the protosphere
References in periodicals archive ?
The electrons that travel between the hemispheres are not the original higher-energy electrons rocketing in from the magnetosphere.
The strong surge in the solar wind so compressed the sun-facing side of Saturn's magnetosphere that the bubble's outer edge was pushed inside the orbit of Titan.
The magnetosphere has a diameter of about 360 km and is surrounded by a ringshaped region about 300 km wide.
The abundances of silicon, sodium and sulfur in the magnetosphere are too high and their ionization states, or charges, too low to be solar wind particles, notes Thomas Zurbuchen of the University of Michigan in Ann Arbor.
In the second part of Aurora, which concerns the solar wind and the magnetosphere, the projections encompassed the entire stage, an awesome effect.
THE PROPAGATION OF ONE AND THREE HUNDRED eV POPULATIONS OF PROTONS IN THE EARTH'S MAGNETOSPHERE B.
The four satellites, called cluster satellites because they travel in formation, will spend the next two years gathering data on the interaction between charged particles from the sun, which are swept towards earth by solar winds, and a magnetic shield surrounding the earth, known as the magnetosphere.
The Earth's geomagnetic field, which gives us our familiar compass bearings, also extends thousands of kilometers out into space in a region called the magnetosphere.
The polar cap boundary corresponds to the surface that separates magnetic field lines that are open to the solar wind from those that are closed to it and is of importance in the dynamics of the Earth's magnetosphere.
Collectively, eruptions from the Sun, disturbances in the solar wind and the twisting and stretching of the Earth's magnetosphere are referred to as space weather.
The soaring whistle and hissing static provide further evidence that Ganymede - the largest moon in the solar system - has its own planet-like, magnetic cocoon called a magnetosphere.
One particular area of study is magnetic reconnection, a physical process in highly conducting plasmas such as those that occur in the Earth's magnetosphere, in which the magnetic topology is rearranged and magnetic energy converted to kinetic or thermal energy.