Physics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.8174r&link_type=abstract
Journal of Geophysical Research, vol. 87, Oct. 1, 1982, p. 8174-8190. Research supported by the Max-Planck-Gesellschaft zur For
Physics
151
Geomagnetism, Helium Ions, Ion Cyclotron Radiation, Magnetospheric Proton Density, Plasma Waves, Plasma-Particle Interactions, Anisotropy, Atmospheric Heating, Collisionless Plasmas, Geos Satellites (Esa), Magnetostatic Fields, Particle Acceleration, Proton Energy, Proton Magnetic Resonance, Secular Variations
Scientific paper
Simultaneous measurements are employed from the ion composition experiment, the energetic particle experiment, and the ULF wave experiment on board the GEOS 1 and GEOS 2 spacecraft. General characteristics of the local time distribution of ion cyclotron waves (ICWs) are presented and compared with those of the thermal anisotropy of energetic protons and the He(plus) abundance. Further calculations of the convective growth rate are conducted by applying two different methods, both of which derive from the measured proton fluxes. The generation conditions of the ICWs in the presence of He(plus) ions are investigated and three possible explanations are discussed: (1) enhanced convection growth rates; (2) lowering of the threshold for absolute instabilities; and (3) change of the ICW wave path (laser-like effect). In addition, it is shown that the flux of suprathermal He(plus) ions is modulated at the ICW frequency.
de Villedary C.
Korth Alex
Kremser Gerhard
Perraut Sylvaine
Rauch Jean-Louis
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