Wave and stability properties of multi-ion plasmas with applications to winds and flows

Details Wave and stability properties of multi-ion plasmas with applications to winds and flows Wave and stability properties of multi-ion plasmas with applications to winds and flows

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..341m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 5, p. 341-353.

Physics

32

Ion Distribution, Magnetohydrodynamic Flow, Magnetohydrodynamic Stability, Plasma Composition, Plasma Waves, Space Plasmas, Electron Plasma, Plasma Compression, Wind Effects

Scientific paper

In many space plasma phenomena heavy ions are present in abundances which are not negligible relative to protons so that the various components of the plasma are mutually coupled through the Lorentz force and the quasi-charge neutrality constraint. Some of the novel and interesting effects which this coupling gives rise to are discussed here within the context of wave and stability properties of the system. In particular we show how differential streaming between the protons and a heavier species (such as alpha particles in the solar wind) can give rise to low frequency compressional instabilities. The effects of Coulomb collisions, finite Debye length and kinetic effects are also discussed and it is emphasized that collisionless Landau damping can quench such instabilities except when the ions are sufficiently cold relative to the electrons. In connection with steady flows (e.g. solar and polar winds) it is shown how the idea of "critical points" must be generalized and interpreted within the framework of the stationary waves of the system ineluding differential streaming, and how these "points" are intimately connected with nonlinear mutual regulation of the ion fluxes.

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