Simulation of the nonlinear evolution of electron plasma waves

Details Simulation of the nonlinear evolution of electron plasma waves Simulation of the nonlinear evolution of electron plasma waves

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619343n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 1, 1991, p. 19,343-19,351.

Physics

20

Bow Waves, Computerized Simulation, Electron Beams, Electron Plasma, Plasma Waves, Electrostatic Waves, Harmonic Radiation, Nonlinear Systems, Wave Excitation

Scientific paper

Electrostatic waves driven by an electron beam in an ambient magnetized plasma were studied using a quasi-1D PIC simulation of electron plasma waves (i.e., Langmuir waves). The results disclose the presence of a process for moving wave energy from frequencies and wavenumbers predicted by linear theory to the Langmuir-like frequencies during saturation of the instability. A decay process for producing backward propagating Langmuir-like waves, along with low-frequency waves, is observed. The simulation results, however, indicate that the backscattering process is not the conventional Langmuir wave decay. Electrostatic waves near multiples of the electron plasma frequency are generated by wave-wave coupling during the nonlinear stage of the simulations, confirming the suggestion of Klimas (1983).

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