Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1717b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1717
Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities
Scientific paper
Observations suggest that current-driven ion cyclotron instability plays important role in the generation of ion cyclotron turbulence and in the concomitant anomalous diffusion and heating processes in space and laboratory plasmas. Theoretical analysis of the current-driven ion cyclotron instability has so far been done for a Maxwellian distribution of electrons drifting through a Maxwellian distribution of ions. In view of the fact that the observed particle velocity distributions in both space and laboratory plasma can often be better modeled by the so-called generalized Lorentzian distributions, also known as the kappa distributions, theoretical analysis of the current-driven ion cyclotron instability is performed using kappa type velocity distribution for electrons and protons with anisotropic temperatures. The analysis is based on the numerical solution of the linear dispersion relation. Influence of temperature anisotropy on the threshold value of the current and on the spectral characteristics (frequency versus wave number) of the excited mode is examined in details for both Maxwellian and kappa distribution plasmas. Numerical analysis allows investigation of parameter regimes that are not accessible to analytic treatments, and thus allows a more comprehensive quantitative comparison between the two types of plasmas.
Basu Baidyanath
Grossbard Neil J.
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