Satellite measurements and theories of low altitude auroral particle acceleration

Physics

Scientific paper

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Auroral Zones, Low Altitude, Particle Acceleration, Satellite Observation, Direct Current, Electric Fields, Electron Acceleration, Electrostatics, Explorer 12 Satellite, Field Aligned Currents, Ion Motion, Plasma Waves, Shock Wave Propagation

Scientific paper

S3-3 satellite measurements of DC electric fields, field-aligned currents, and waves are applied to the evidence in support of auroral particle acceleration at altitudes below 8000 km. These data include two special scale sizes in perpendicular and parallel electric fields; the predominance of S-shaped instead of V-shaped equipotential contours on both spatial scales, intense waves inside the electrostatic shocks and important wave-particle interactions. They also provide correlations of field-aligned currents with magnetospheric boundaries determined by convection electric field measurements; electron acceleration producing discrete auroral arcs in the smaller scale fields and inverted-V events in the larger scale fields; and ion and electron acceleration resulting from wave-particle interactions and the parallel electric fields.

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