Alfven instabilities in streaming plasmas with anisotropic pressures and their relevance for the solar wind

Details Alfven instabilities in streaming plasmas with anisotropic pressures and their relevance for the solar wind Alfven instabilities in streaming plasmas with anisotropic pressures and their relevance for the solar wind

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..165v&link_type=abstract

Astrophysics and Space Science, vol. 46, Jan. 1977, p. 165-173.

Astronomy and Astrophysics

Astrophysics

5

Destabilization, Magnetohydrodynamic Flow, Magnetohydrodynamic Stability, Pressure Effects, Solar Wind Velocity, Anisotropy, Flow Velocity, Helium Plasma, Hydrogen Plasma, Particle Acceleration

Scientific paper

Low-frequency or Alfven waves in streaming plasmas can become unstable when the square of the Alfven velocity is smaller than the mean square of the bulk motion in a comoving reference frame. For these Alfven instabilities, the streaming effects can be enhanced by a suitable pressure anisotropy. Perpendicular pressure effects are stabilizing, and parallel pressure effects are destabilizing, as in the usual firehose instability. The observed velocity differences between helium and the main (hydrogen) flow in the solar-wind plasma are such that the Alfven waves approach marginal instability. These instabilities limit the velocity differences between helium and hydrogen and thus provide a possible mechanism for accelerating the helium particles up to the order of the main flow velocity.

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