Magnetospheric electric fields and their variation with geomagnetic activity

Physics – Space Physics

Scientific paper

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Electric Fields, Geomagnetism, Kp Index, Magnetic Variations, Magnetospheric Instability, Solar Wind Velocity, Atmospheric Models, Auroral Zones, Convective Flow, Magnetic Effects, Particle Energy, Stagnation Point

Scientific paper

Effects of large-scale electric fields on charged-particle behavior in the magnetosphere are investigated by obtaining a relation between the magnitude of a uniform cross-magnetospheric electric field and Kp index. Comparisons with both theory and observation for local times other than dusk show that this relation is compatible with various independent measurements of particle-convection boundaries in different magnetospheric local-time regions and is probably more reliable than previously obtained results. Observations of the plasmapause are noted which show that the present relation is consistent with observations even at very large Kp values. A relation between solar-wind velocity and Kp index is derived, and properties of the inner edge of the plasma sheet at midnight are evaluated.

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