Quasilinear theory for oblique low-frequency instabilities in streaming cold plasmas

Details Quasilinear theory for oblique low-frequency instabilities in streaming cold plasmas Quasilinear theory for oblique low-frequency instabilities in streaming cold plasmas

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..883v&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 10, p. 883-888

Physics

2

Cold Plasmas, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Wave Propagation, Comets, Doppler Effect, Kinetic Energy, Magnetic Fields

Scientific paper

A quasilinear theory is given which deals with the modification of equilibrium streaming in a multifluid cold plasma, due to the growth of unstable low-frequency waves which propagate at an angle to the external magnetic field. Expressions are obtained for the levels of magnetic field fluctuations at saturation, for both the shear and the fast Alfven modes. If initially there is enough energy in the relative streaming, then the highest levels of turbulence occur for the fast mode propagating at a nonzero angle, rather than for the shear mode, although the growth rate for both is greatest at parallel propagation. As an example, we briefly mention the saturation of nonresonant instabilities near comets.

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