Instability and saturation of driftconvective modes in an inhomogeneous plasma
Abstract
It is found that the inclusion of the electron inertia effect (parallel to an external magnetic field) can provide a linear coupling between the electrostatic drift and the convective modes in a nonuniform plasma. This coupling leads to new branches of rapidly growing modes, which are calculated in the kinetic as well as in the hydrodynamic regimes. To study the saturation of the linear unstable modes, we account for the mode coupling and derive a set of model nonlinear fluid equations. A perturbation technique is employed to obtain a nonlinear evolution equation. In the steady state, the latter yields the saturated electric potential. It is argued that the enhanced lowfrequency fluctuations can cause anomalous particle transport in a magnetoplasma.
 Publication:

Journal of Plasma Physics
 Pub Date:
 April 1987
 DOI:
 10.1017/S0022377800012083
 Bibcode:
 1987JPlPh..37..163B
 Keywords:

 Convective Flow;
 Electrostatic Waves;
 Magnetohydrodynamic Stability;
 Nonuniform Plasmas;
 Plasma Drift;
 Plasma Oscillations;
 Branching (Mathematics);
 Coupled Modes;
 Nonlinear Evolution Equations;
 Saturation;
 Two Fluid Models;
 Plasma Physics