Substorms in the earth's magnetosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Earth Magnetosphere, Energy Dissipation, Magnetic Storms, Polar Substorms, Solar Terrestrial Interactions, Geomagnetic Tail, Magnetic Field Reconnection, Neutron Stars, Particle Acceleration, Radio Jets (Astronomy), Solar Flares

Scientific paper

Magnetospheres are plasma regions of large scale in space dominated by magnetic field effects. The earth, and many planets in the solar system, are known to have magnetospheric regions around them. Magnetospheric substorms represent the intense, rapid dissipation of energy that has been extracted from the solar wind and stored temporarily in the terrestrial magnetotail. In this paper a widely, but not universally, accepted model of substorms is described. The energy budgets, time scales, and conversion efficiencies for substorms are presented. The primary forms of substorm energy dissipation are given along with the average levels of the dissipation. Aspects of particle acceleration and precipitation, Joule heating mechanisms, ring current formation, and plasmoid escape are illustrated based on in situ observations taken from the large available data base. A brief description is given of possible analogues of substorm-like behavior in other astrophysical systems.

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