Ion-Acoustic Waves Triggered by Left-Hand Polarized Finite Amplitude Waves Propagating in the Beam Direction

Details Ion-Acoustic Waves Triggered by Left-Hand Polarized Finite Amplitude Waves Propagating in the Beam Direction Ion-Acoustic Waves Triggered by Left-Hand Polarized Finite Amplitude Waves Propagating in the Beam Direction

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh13a0398g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH13A-0398

Physics

Plasma Physics

2149 Mhd Waves And Turbulence (2752, 6050, 7836), 4400 Nonlinear Geophysics (3200, 6944, 7839), 7800 Space Plasma Physics, 7815 Electrostatic Structures

Scientific paper

Nonlinear ion-acoustic like waves triggered by large amplitude circularly polarized waves propagating in the direction of a proton beam are studied. The properties are strongly dependent on the nature of the large amplitude wave. Waves belonging to the Alfvén branch of the dispersion relation require much larger amplitude values to excite the ion-acoustic waves than those belonging to the beam branch of the dispersion relation. The former can trigger only forward propagating waves and always above a wavenumber threshold, while the latter can destabilize forward as well as backward propagating waves with a zero wavenumber threshold. It is shown that in some cases the unstable frequency spectrum is very narrow, and damping rates are very small even under conditions where the linear theory predicts strong Landau damping. It is conjectured that these type of waves might be of common occurrence in the fast solar wind, preferably closer to the Sun. These results are consistent with observation of electrostatic ion-acoustic like emissions in the solar wind.

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