Accession Number : AD0772533

Title :   Parametric Instabilities Induced by the Coupling of High and Low Frequency Plasma Modes,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Manheimer,Wallace M. ; Ott,Edward

Report Date : DEC 1973

Pagination or Media Count : 40

Abstract : A general dispersion relation is derived for parametric instabilities caused by a large amplitude pump wave which couples high and low frequency modes of a magnetized plasma. The nonlinear effects coupling the high and low frequency waves are: (1) the low-frequency pondermotive force due to the coupling of the pump with the high frequency perturbations, and (2) the high frequency nonlinear source current density produced by coupling of the pump with the low frequency perturbations. The dispersion relation contains decay instabilities, purely growing instabilities, modulational instabilities, self-focusing and nonlinear Landau damping. As examples the authors apply the dispersion relation to self-focusing, magnetosonic decay and purely growing instabilities, whistler decay and nonlinear Landau damping of electron plasma waves and transverse electromagnetic waves. (Author)

Descriptors :   *Plasmas(Physics), Instability, Dispersion relations, Electron density, Whistlers, High frequency, Low frequency, Oscillation

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE