Magnetohydrodynamic waves and instabilities in the heat-conducting solar wind plasma

Details Magnetohydrodynamic waves and instabilities in the heat-conducting solar wind plasma Magnetohydrodynamic waves and instabilities in the heat-conducting solar wind plasma

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..775h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, Aug. 1988, p. 775-783.

Physics

4

Heat Flux, Magnetohydrodynamic Stability, Plasma Waves, Solar Wind, Anisotropic Media, Phase Velocity, Propagation Modes, Thermal Conductivity

Scientific paper

The solar wind plasma is a heat-conducting, thermally anisotropic plasma. This paper studies the various wave modes and instabilities in such a plasma, based on a closed system of governing equations obtained by Whang (1971). The inclusion of heat fluxes leads to the presence of two new wave modes, in addition to the Alfvén, slow magnetosonic and fast magnetosonic modes. The presence of the zeroth-order heat fluxes also results in an asymmetry in the wave speed and a new MHD instability. The new unstable wave propagates in the direction of the heat fluxes. It is demonstrated that the Alfvén wave and the associated fire-hose instability are not affected by the presence of heat fluxes, while the exclusion of heat fluxes may suppress the development of the mirror instability. The results are also applied to the heat-conducting solar wind.

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