Solar wind control of magnetospheric convection

Physics

Scientific paper

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Convection, Earth Magnetosphere, Solar Terrestrial Interactions, Solar Wind, Boundary Layer Plasmas, International Magnetospheric Study, Interplanetary Magnetic Fields, Magnetic Flux, Magnetosheath

Scientific paper

During the International Magnetospheric Study, the physical processes which drive magnetospheric convection by coupling the magnetosphere and magnetosheath across the magnetopause were observed. Spacecraft data obtained at high and low altitudes indicate that viscously driven closed boundary layers typically contribute only 5 to 10 kV to the cross-magnetosphere voltage, while the observed reconnection-associated processes are compatible with a source of at least several tens of kV. The latter processes are shown to be strongly modulated by interplanetary magnetic field Bz, as required by the similar correlation observed in the total transpolar potential. These results support pre-IMS inferences that reconnection processes are dominant in driving magnetospheric convection.

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