Parametric instability in a weakly ionized magnetoactive plasma
The stability of a weakly ionized homogeneous plasma, situated in a weak superhigh frequency (shf) electric field and a constant magnetic field, is studied. Expressions are obtained for longitudinal wave deviation increments in the plasma, and for the threshold values of the external shf field, at which the system begins to develop instability. It is shown that the presence of the external magnetic field produces either a stabilizing or a destabilizing effect on the system, dependent on the orientation of the shf field. In particular, when the direction of the magnetic field B is perpendicular to the electric fieldE and the Langmuir electron frequency ωLe= (4πneee2/me)1/2 is less than the cyclotron electron frequency Ωe = eeB/mec, the threshold value of shf electric field intensity in (ωLe/Ω)3 is lower than the corresponding value for an isotropic plasma.
KeywordsMagnetic Field Longitudinal Wave Industrial Mathematic External Magnetic Field Field Intensity
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