Physics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5983l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5983-5995. Research supported by CNES.
Physics
110
Auroral Zones, Electromagnetic Fields, Electron Capture, Kilometric Waves, Space Plasmas, Viking Spacecraft, Electron Distribution, Proton Flux Density
Scientific paper
Simultaneous measurements of electromagnetic fields and particle distributions, made by the spacecraft Viking during the crossing of an auroral kilometric radiation (AKR) source, are presented. It is shown that the AKR is generated within an acceleration region characterized by an upward directed parallel electric field. Particle observations inside the AKR source show that the potential drop below the spacecraft produces upward moving field-aligned ion beams, and downward-accelerated electrons above it. A large fraction of these electrons with small parallel velocities is trapped in a region of velocity space which should be empty in a simple adiabatic theory. It is suggested that the electrons are trapped when they experience a time- or space-varying parallel electric field. Since trapped electrons can cause positive gradients over a broad range of parallel velocities, it is concluded that they are the free energy source for the AKR.
André Martial
de Feraudy Herve
Le Queau Dominique
Louarn Ph.
Roux Alain
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