Determination of auroral electrostatic potentials using high- and low-altitude particle distributions

Details Determination of auroral electrostatic potentials using high- and low-altitude particle distributions Determination of auroral electrostatic potentials using high- and low-altitude particle distributions

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7441r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7441-7465.

Physics

139

Auroral Zones, Dynamics Explorer Satellites, Electric Potential, Electron Precipitation, Maxwell-Boltzmann Density Function, Atmospheric Turbulence, Electric Fields, Ion Beams, Magnetic Fields, Particle Acceleration, Thermal Energy, Velocity Distribution

Scientific paper

The auroral electrostatic potential differences were determined from the particle distribution functions obtained nearly simultaneously above and below the auroral acceleration region by DE-1 at altitudes 9000-15,000 km and DE-2 at 400-800 km. Three independent techniques were used: (1) the peak energies of precipitating electrons observed by DE-2, (2) the widening of loss cones for upward traveling electrons observed by DE-1, and (3) the energies of upgoing ions observed by DE-1. The assumed parallel electrostatic potential difference calculated by the three methods was nearly the same. The results confirmed the hypothesis that parallel electrostatic fields of 1-10 kV potential drop at 1-2 earth radii altitude are an important source for auroral particle acceleration.

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