Linear and Nonlinear Electromagnetic and Electrostatic Instabilities in a Plasma With two ion Beams

Details Linear and Nonlinear Electromagnetic and Electrostatic Instabilities in a Plasma With two ion Beams Linear and Nonlinear Electromagnetic and Electrostatic Instabilities in a Plasma With two ion Beams

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh23a1158g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH23A-1158

Physics

2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2164 Solar Wind Plasma, 2772 Plasma Waves And Instabilities (2471), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7868 Wave/Wave Interactions

Scientific paper

Linear and nonlinear properties of a plasma system with a proton and an alpha-particle beam, are studied. It is shown that the presence of a second beam can change the linear and nonlinear stability thresholds of the magnetosonic instabilities. Since the nonlinear dispersion relation of the nonlinear waves have 14 roots, the system is very reach in parametric decays. There are parametric decays which clearly cannot be present in a one beam system. These parametric decays are of the decay type, modulational, and essentially electromagnetic beat wave instabilities. In a previous paper [Gomberoff, 2007, JGR in press], the stabilization roperties of the magnetosonic instability triggered by the presence of a large amplitude Alfén waves for fix temperature were studied. Here the study is extended to large amplitude waves belonging to the dispersion branch having a resonance at the proton gyrofrequency, for several temperature values. It is shown that the threshold amplitude for stabilization can suffer drastic changes with respect to the one beam system. Finally, it is shown that when both beams trigger their own magnetosonic instabilities, the system can also be stabilized by the presence of the large amplitude wave.

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