Amplitude modulation of Langmuir waves: Vlasov simulation

Details Amplitude modulation of Langmuir waves: Vlasov simulation Amplitude modulation of Langmuir waves: Vlasov simulation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31b0329u&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31B-0329

Physics

2772 Plasma Waves And Instabilities (2471), 6984 Waves In Plasma (7867), 7829 Kinetic Waves And Instabilities, 7863 Turbulence (4490), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Mechanisms for the generation of Langmuir wave packets are studied by performing a one-dimensional electrostatic Vlasov simulation. The present simulation of a weak-electron-beam instability without ion dynamics suggests two new processes for the amplitude modulation of Langmuir waves. The beam instability excites Langmuir modes over a wide wavenumber range, but the saturation of the most unstable Langmuir mode "filters" the growth of sideband modes. Specific upper and lower sideband modes linearly grow to a high saturation level. Then the primary Langmuir mode is amplified and strongly modulated through interaction with the sideband modes.

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