Effect of nonlinear circularly polarized waves on linear instabilities triggered by an alpha particle beam

Details Effect of nonlinear circularly polarized waves on linear instabilities triggered by an alpha particle beam Effect of nonlinear circularly polarized waves on linear instabilities triggered by an alpha particle beam

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11102101g&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A2, CiteID A02101

Physics

Plasma Physics

8

Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Electrostatic Structures, Nonlinear Geophysics: Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852), Space Plasma Physics: Mhd Waves And Instabilities (2149, 2752, 6050)

Scientific paper

It is shown that nonlinear left-hand polarized waves can either stabilize or destabilize linear right-hand polarized instabilities triggered by an alpha particle beam in a magnetized electron proton plasma. For differential alpha particle speeds above the threshold for instability the destabilization depends upon the plasma βi = vth.i/vA, where vth.i is the thermal velocity of the i plasma component and vA is the Alfvén velocity. For any given finite-amplitude wave frequency, there is always a βi value such that above this value the system is destabilized further. For drift alpha particle speeds well above the instability threshold the destabilization can occur for any βi. It is also shown that the presence of the large-amplitude wave can trigger purely electrostatic ion-acoustic instabilities. The unstable waves are supported by the proton core.

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