Stabilization of the electrostatic Kelvin-Helmholtz instability in high beta plasmas

Details Stabilization of the electrostatic Kelvin-Helmholtz instability in high beta plasmas Stabilization of the electrostatic Kelvin-Helmholtz instability in high beta plasmas

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8991h&link_type=abstract

Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 8991-9000.

Physics

27

Electrostatics, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Beta Factor, Magnetohydrodynamic Flow, Space Plasmas

Scientific paper

The paper presents a theory of the electrostatic Kelvin-Helmholtz instability, which is driven by a parallel velocity flow and is sheared transverse to the magnetic field in finite beta plasmas. The Vlasov theory is used so that finite Larmor radius effects and wave particle resonances are properly treated, and the complete coupling of electrostatic and electromagnetic oscillations is considered. The electrostatic Kelvin-Helmholtz instability in high beta plasmas is found to be stable, with the actual value of beta for stabilization depending on the parameters. Stabilization is attributed to resonant and nonresonant magnetic gradient effects. Results are applied to several space plasmas including solar cusp, cometary tails, and magnetopause, and estimates are made of the anomalous diffusion coefficient associated with the instability.

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