Stability of H(+) beams in the polar wind

Details Stability of H(+) beams in the polar wind Stability of H(+) beams in the polar wind

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1487b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1487-1494.

Physics

18

Hydrogen Ions, Ion Beams, Positive Ions, Solar Wind, Space Plasmas, Convection, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Polar Caps, Polar Cusps, Supersonic Flow

Scientific paper

The effect of energetic H(+) beams on the stability of the polar wind in the classical model is studied with regard to the excitation of electrostatic waves. Consideration is given to cases covering a wide range of electron-to-background temperature ratios and beam-to-background ion density ratios, assuming a relatively cold beam. The minimum beam drift velocity required to destabilize the plasma is determined by a combination of the Nyquist technique and a direct solution of the plasma dispersion equation. It is found that the plasma can be destabilized for relative drift energies less than about 1 eV. Also, it is shown that the plasma is less stable for large electron temperatures and for comparable ion and beam densities.

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