Kinetic theory of magnetohydrodynamic KelvinHelmholtz instability
Abstract
The magnetohydrodynamic KelvinHelmholtz instability in a low β collisionless plasma with smooth variations in plasma parameters across the boundary is studied. The surface Alfvén wave which is excited by the KelvinHelmholtz instability is shown to be modeconverted to the kinetic Alfvén wave (Alfvén wave with finite ion Larmor radius and electron inertia correction). Linear and nonlinear effects of this kinetic Alfvén wave on the KelvinHelmholtz instability are discussed. Because the resonant mode conversion enhances the wave amplitude, the nonlinear effect is manifested. In particular, the magnetic field pressure of the kinetic Alfvén wave exerts acceleration on the plasma at the higher density side toward the lower density side and may cause the RayleighTaylor instability at the boundary layer.
 Publication:

Physics of Fluids
 Pub Date:
 August 1976
 DOI:
 10.1063/1.861620
 Bibcode:
 1976PhFl...19.1139O
 Keywords:

 Collisionless Plasmas;
 Electromagnetic Surface Waves;
 KelvinHelmholtz Instability;
 Kinetic Theory;
 Magnetohydrodynamic Stability;
 Magnetohydrodynamic Waves;
 Boundary Layer Stability;
 Magnetic Fields;
 Plasma Density;
 Plasma Resonance;
 Pressure Effects;
 Plasma Physics