Adiabatic motion of auroral particles in the magnetosphere. III - Neutral-sheet field

Physics

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Adiabatic Conditions, Auroral Zones, Electron Precipitation, Geomagnetic Tail, Magnetospheric Electron Density, Particle Motion, Diurnal Variations, Kinetic Energy, Plasma Layers, Power Series, Solar Wind

Scientific paper

The motion of auroral particles with pitch-angles of 90 degrees in the magnetospheric tail is studied. The mean drift trajectories are calculated analytically by series expansion near the mirror point. The particles are shown to drift along equipotential lines, the mirror points rising above the equatorial plane as the geocentric distance decreases. The possible precipitation of solar-wind electrons into the convection zone across the evening boundary of the magnetosphere, as a result of centrifugal and gradient drifting, is examined; these electrons propagate over distances of roughly 1000 earth radii. Their drift orbits are steady closed orbits located partially within and partially beyond the magnetosphere.

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