Energetic particle precipitation in the substorm growth phase measured by EISCAT and Viking

Details Energetic particle precipitation in the substorm growth phase measured by EISCAT and Viking Energetic particle precipitation in the substorm growth phase measured by EISCAT and Viking

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6025k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6025-6037. Research supported by NFR.

Physics

22

Auroral Zones, Eiscat Radar System (Europe), Ionospheric Electron Density, Particle Precipitation, Polar Substorms, Viking Spacecraft, Auroral Arcs, Electron Scattering, Energetic Particles, Plasma Sheaths

Scientific paper

Particle precipitation into the evening auroral oval in the 1-2 hours preceding substorm onset has been studied using measurements from the EISCAT incoherent scatter radar, complemented by measurements from the Viking satellite. The ionization between 100 and 160 km altitude is found to correspond to precipitation of approximately Maxwellian populations of ions with average energies of 10-20 keV and of electrons with average energies of 1-3 keV. A high-energy tail in the electron precipitation is found to account for the ionization below 100 km altitude in the equatorward and poleward parts of the precipitation zone. A distinct population of high-energy electrons, with energies of several tens of keV or more, is, however, required to explain the ionization profiles in the center of the zone. The ions and separate population of high-energy electrons are precipitated from close to the respective stable trapping boundaries (where the particle pitch angle distribution changes from isotropic to trapped). It is suggested that the latter electrons are scattered into the loss cone as the magnetic field becomes more taillike during the substorm growth phase and the radius of field line curvature in the equatorial plane becomes unusually small.

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