Linear Beam-Plasma Instabilities in the Presence of Finite Amplitude Backward Propagating Waves

Details Linear Beam-Plasma Instabilities in the Presence of Finite Amplitude Backward Propagating Waves Linear Beam-Plasma Instabilities in the Presence of Finite Amplitude Backward Propagating Waves

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh31a1174h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH31A-1174

Physics

7839 Nonlinear Phenomena, 7867 Wave/Particle Interactions, 7868 Wave/Wave Interactions, 7871 Waves And Instabilities, 0689 Wave Propagation (4275)

Scientific paper

In previous works finite amplitude circularly polarized waves propagating forward relative to the background magnetic field were shown to affect the behavior of linear proton beam-plasma instabilities [1-4]. We now study the behavior of these instabilities in the presence of finite amplitude circularly polarized backward propagating waves. We find that the presence of both right-hand and left-hand polarized backward propagating waves stabilize linear beam-plasma right-hand instabilities when their amplitude is above a treshold value. It has been shown than forward propagating waves can stabilize right-hand instabilities [1-3]. Here we show that the threshold wave amplitude required to stabilize the right-hand instabilty is larger for forward propagating waves than the amplitude threshold for backward propagating waves. Thus, backward propagating waves can be in some physical conditions a more efficient mechanism to stabilize linear right-hand instabilities. Also we find that the presence backward propagating waves can produce electrostatic instabilities by making the phase velocities of the linear ion acoustic waves become equal above a treshold amplitude value. These results can be relevant in various space plasma enviroments. špace{12pt} indent=0pt References [1] L. Gomberoff, Stabilization of linear ion beam right-hand polarized instabilities by nonlinear Alfvén/ion-cyclotron waves, J.Geophys.Res., 108 (A6), 1261, doi: 10.1029/2003JA009387, 2003. [2] L. Gomberoff, J. Hoyos, and A. L. Brinca, Effect of a large amplitude circularly polarized wave on linear beam-plasma electromagnetic instabilities, J. Geophys. Res., 108 (A12), 1472, doi: 10.1029/2003JA010144, 2003. [3] J. Araneda and L. Gomberoff, Stabilization of right-hand beam plasma instabilities due to a large amplitude left-hand polarized wave: A simulation study, J. Geophys. Res., 109, A01106, doi: 10.1029/2003JA010189, 2003. [4] L. Gomberoff, J. Hoyos, A. L. Brinca and R. Ferrer, Electrostatic instabilities induced by large amplitude left-hand polarized waves, J. Geophys. Res., 109, A07108, doi:10.1029/2004JA 010466, 2004.

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