Physics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710487k&link_type=abstract
Journal of Geophysical Research, vol. 87, Dec. 1, 1982, p. 10487-10502.
Physics
27
Auroral Zones, Beam Plasma Amplifiers, Electrostatic Waves, Ion Beams, Magnetohydrodynamic Stability, Power Spectra, Distribution Functions, Ion Cyclotron Radiation, Ionospheric Ion Density, Landau Damping, Space Plasmas
Scientific paper
The stability of electrostatic waves with frequencies near the hydrogen cyclotron frequency is investigated for an auroral plasma containing an ion beam by studying the relationship between low-frequency waves (0-1 kHz) and particles seen by the S3-3 satellite. It is concluded that only electrostatic hydrogen ion cyclotron (EHC) waves can be generated at the observed frequencies by the observed energetic particles, with the waves being produced either by drifting electrons or by the ion beam. In the model developed, ion beams are seen with their observed temperatures because they have evolved to a weakly unstable configuration in which the wave growth length is comparable to the width of the beam region. Waves are well confined to the beams because they are damped rapidly in the adjacent plasma, and the mirror effect can maintain a weak instability over a considerable altitude range. It is proposed that this effect is a source for strong pitch angle scattering, as well as an explanation for the nonexistence of downgoing ion beams.
Kaufmann Richard L.
Kintner Paul M.
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