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 ?
Recent observations with the ESA's Cluster satellites also suggest that the magnetosphere is more like a sieve than a shield, often allowing the solar wind to flow in.
Jupiter's magnetosphere also had its own source of plasma in the form of the planet's innermost moon, Io.
Ionized water vapor from Enceladus streams out at 12 to 250 kilograms (27 to 551 pounds) per second, yet observations show that the concentration of plasma in Saturn's magnetosphere is at a relatively steady level.
One of the most common forms of space weather, a geomagnetic storm describes any event in which the magnetosphere is suddenly, temporarily disturbed.
His studies on the Earth's plasmasphere, as well as the electric fields of the inner magnetosphere that control it, clearly establish him as the leading authority in this field.
The microchips aboard Juno are part of the Jupiter Energetic Particle Detector Instrument, or JEDI, a cutting-edge instrument that will measure the composition of the immense magnetic system surrounding the planet, called a magnetosphere.
The spacecraft will measure Jupiter's polar magnetosphere and explore the solar system's most powerful auroras - the planet's northern and southern lights - by flying directly through them.
Auroras are produced in the atmosphere as charged solar wind particles accelerate in the magnetosphere and are guided by the magnetic field close to the magnetic poles -- that's why the Earthly auroras are found around high latitudes.
IBEX will make the first astronomical use of a new technique called neutral-atom imaging, pioneered by satellites studying particle acceleration in the Earth's magnetosphere.
The bubble, or magnetosphere, is the solar system's largest structure with sharp boundaries and has a diameter greater than 100 times that of the giant planet.
In March, NASA launched the ST5 satellites to study both the Earth's magnetosphere as well as to demonstrate new technologies to be used in space.
Tender issueSMILE (Solar wind Magnetosphere Ionosphere Link Explorer) is a joint science mission between ESA and the Chinese Academy of Sciences (CAS) with a planned launch date in 2021.