Nonlinear Development of Weak Beam-Plasma Instability and Generation of Harmonic Langmuir Waves

Details Nonlinear Development of Weak Beam-Plasma Instability and Generation of Harmonic Langmuir Waves Nonlinear Development of Weak Beam-Plasma Instability and Generation of Harmonic Langmuir Waves

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh21a0742y&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH21A-0742

Physics

7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions, 7868 Wave/Wave Interactions, 7871 Waves And Instabilities

Scientific paper

Generation of harmonic Langmuir mode(s) has been known since the 1960s in beam-plasma laboratory experiments, and space observations have shown that such a phenomenon may occur in interplanetary space. Despite early theoretical attempt for the explanation, its true characteristics is becoming clear only quite recently through detailed computer simulations. In this paper, a discussion which aims to show that the harmonic Langmuir mode is an eigemode of a turbulent plasma is presented, and generalized weak turbulence equation which includes the harmonic Langmuir mode is numerically solved. The analysis shows that the harmonic mode, which is a solution to a nonlinear dispersion equation, hence a ``nonlinear'' eigenmode, grows primarily due to an induced emission process, which is a ``linear'' wave-particle interaction process.

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