Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..207g&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 36, Feb. 1988, p. 207-212. Research supported by the Universidad de Chile.
Physics
3
Cold Plasmas, Cyclotron Resonance, Ion Temperature, Magnetospheric Instability, Space Plasmas, Temperature Effects, Ion Cyclotron Radiation, Plasma Interactions, Proton Energy
Scientific paper
The main effect of cold ions on the electromagnetic proton-cyclotron instability is shown to be a shift in the unstable spectrum. If the only cold species are protons, the spectrum is shown to shift to lower frequencies. It is noted that if the maximum convective growth rate in the absence of cold protons lies close to the marginal mode then the shift of the spectrum leads also to a large amplification. The results indicate that since the thermal anisotropy decreases as the instability develops, the instability lasts longer in the presence of cold protons than in their absence. The catalytic role of cold He(+) in the generation of ion cyclotron waves in the magnetosphere is also considered.
Gomberoff Luis
Rogan Jose
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