Wave-particle interactions near Omega/He plus/ observed on GEOS 1 and 2. I - Propagation of ion cyclotron waves in He/plus/-rich plasma

Details Wave-particle interactions near Omega/He plus/ observed on GEOS 1 and 2. I - Propagation of ion cyclotron waves in He/plus/-rich plasma Wave-particle interactions near Omega/He plus/ observed on GEOS 1 and 2. I - Propagation of ion cyclotron waves in He/plus/-rich plasma

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6755y&link_type=abstract

Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6755-6772. Research supported by the Swiss National Science Foundati

Physics

216

Earth Magnetosphere, Geos Satellites (Esa), Helium Plasma, Ion Cyclotron Radiation, Plasma-Particle Interactions, Space Plasmas, Cold Plasmas, Electric Fields, Energetic Particles, Geos 1 Satellite, Geos 2 Satellite, Plasma Waves, Positive Ions, Protons, Wave Propagation

Scientific paper

Equatorial magnetosphere interactions involving protons in the energy range 20 keV to 300 keV and ULF waves with frequencies below the proton gyrofrequency are considered in light of GEOS 1 and 2 satellite particle and wave detector data. It is shown that most of the ion cyclotron waves (ICWs) detected in this frequency range have spectra whose characteristic frequencies are organized in the He(plus) gyrofrequency. The general characteristics of these helium-associated ULF events are presented in case studies of four events, which are interpreted in terms of the propagation of ICWs in a He(plus)-rich plasma. It is shown that the shape of the cold plasma dispersion curve can adequately explain the main characteristics of the observed waves.

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