Linear analysis of ion cyclotron interaction in a multicomponent plasma

Details Linear analysis of ion cyclotron interaction in a multicomponent plasma Linear analysis of ion cyclotron interaction in a multicomponent plasma

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9119g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 9119-9124.

Physics

65

Ion Cyclotron Radiation, Plasma Diagnostics, Plasma-Electromagnetic Interaction, Space Plasmas, Helium Ions, Hydrogen Plasma, Linear Equations, Plasma Composition, Proton Density (Concentration)

Scientific paper

The mechanism by which hot anisotropic protons generate electromagnetic ion cyclotron waves in a plasma containing cold H(+) and He(+) ions is quantitatively studied. Linear growth rates (both temporal and spatial) are computed for different plasma parameters: concentration, temperature,and anisotropy of cold He(+) ions and of hot protons. It is shown that: (1) for parameters typical of the geostationary altitude the maximum growth rates are not drastically changed when a small proportion (about 1 to 20 percent) of cold He(+) ions is present; (2) because of the important cyclotron absorption by thermal He(+) ions in the vicinity of the He(+) gyrofrequency, waves which could resonate with the bulk of the He(+) distribution cannot be generated. Therefore quasi-linear effects, in a homogeneous medium at least, cannot be responsible for the heating of He(+) ions which is often observed in conjunction with ion cyclotron waves. The variation of growth rate versus wave number is also studied for its importance in selecting suitable parameters in numerical simulation experiments.

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