Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89...27m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 27-36.
Physics
20
Anisotropic Media, Collisionless Plasmas, Magnetohydrodynamic Stability, Shear Flow, Solar Wind Velocity, Space Plasmas, Ion Acoustic Waves, Kelvin-Helmholtz Instability, Magnetohydrodynamic Waves
Scientific paper
The linear and quasi-linear theory of perturbations in finite-β, collisionless plasmas that incorporate a sheared velocity flow is developed. A simple, one-dimensional magnetic field geometry is assumed to adequately represent solar wind conditions near the sun, i.e., at R ≈ 0.3 AU. Two modes are examined in detail: an ion-acoustic mode (finite-β stabilized) and a compressional Alfvén mode (finite-β threshold, high-β stabilization). The role played by equilibrium temperature anisotropies, in the linear stability of these modes, is also presented. From the quasi-linear theory, the effects of waves on the state of temperature components (parallel and perpendicular to the magnetic field) of the solar wind is determined: qualitative agreement with the observed anisotropies of electrons and ions is obtained. The quasi-linear temperature changes are also shown to result in saturation of these instabilities.
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