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 ?
According to the press release, "NASA has launched a fleet of missions to study the planets in our solar system - many of which have sent back crucial information about magnetospheres. The twin Voyagers measured magnetic fields as they traveled out to the far reaches of the solar system, and discovered Uranus and Neptune's magnetospheres.
We have gathered the presence of magnetospheres outside of our solar system by observing auroras outside which indicate the presence of a magnetosphere.
The speaker added that although it was not generally possible for solar wind particles to penetrate into Saturn's magnetosphere --the combination of the electrical charge of the particles and the magnetic field of the planet made this impossible--there were two points on the magnetosphere's boundary immediately above the planet's north and south poles where the planet's magnetic field was relatively weak, and where charged solar wind particles could penetrate it; these were termed cusps.
Jupiter's magnetosphere also had its own source of plasma in the form of the planet's innermost moon, Io.
Using information from the (https://voyager.jpl.nasa.gov/science/uranus.html) Voyager 2 spacecraft flyby in 1986, scientists at the Georgia Institute of Technology revealed Monday that the planet's magnetosphere flips on and off like a light switch- every single day.
Earth's magnetosphere, in contrast, typically only alters between open and closed in response to changes in solar wind.
Messenger also found solar plasma in Mercury's magnetosphere linked to the KH waves, suggesting the large waves shuttle plasma towards the planet.
With this information, scientists hope to better understand the physics that influence Earths magnetosphere. This is particularly important because this is where most space assets, including communications satellites, reside and such satellites are sensitive to severe space weather caused by the solar wind.
Surfaces of atmosphere-less bodies are exposed without any shielding by a dense atmosphere or magnetosphere - causing them to be heavily weathered by meteoroids or the solar wind, forming a very rough and chaotic surface called regolith.
The one-of-a-kind opportunity gave scientists an intimate view of the havoc that the comets passing wreaked on the magnetic environment, or magnetosphere, around Mars.
Because a magnetic field helps to preserve atmospheres and oceans, a magnetosphere may signify that a planet has complex surface life.
Analysis of data beamed back by one of the 11 payloads carried by the lunar orbiter, SARA ( Sub- keV Atom Reflecting Analyser), shows the presence of a mini- magnetosphere on the lunar surface.