Combined effect of cold H/+/ and He/+/ ions on the proton cyclotron electromagnetic instability

Details Combined effect of cold H/+/ and He/+/ ions on the proton cyclotron electromagnetic instability Combined effect of cold H/+/ and He/+/ ions on the proton cyclotron electromagnetic instability

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87...95g&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 95-100.

Physics

38

Helium Ions, Hydrogen Ions, Ion Cyclotron Radiation, Ion Temperature, Magnetohydrodynamic Stability, Magnetospheric Proton Density, Extremely Low Radio Frequencies, Geos 1 Satellite, Geos 2 Satellite, Gyrofrequency

Scientific paper

A correlation between (1) the generation of strong ion-cyclotron ULF waves below the proton gyrofrequency, and (2) an increase in the He(+) ion concentration, is found by GEOS 1 and 2 observations. Although the amplification process due to one cold species has been discussed in the literature, similar attention has not yet been given to the amplification process when two cold species are present. GEOS experiments have also shown an association between the presence of thermal He(+) ions in the equatorial region of the magnetosphere and the occurrence of ion-cyclotron ULF waves, suggesting the present study of cold He(+) and H(+) ions' combined effect on the proton cyclotron electromagnetic instability.

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