Beam instability of the Z mode in the solar wind

Details Beam instability of the Z mode in the solar wind Beam instability of the Z mode in the solar wind

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3527k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3527-3534. Research supported by the U.S. Navy.

Physics

11

Electron Beams, Interplanetary Medium, Magnetohydrodynamic Stability, Solar Wind, Cold Plasmas, Electron Distribution, Hot Electrons, Magnetic Effects

Scientific paper

The instability of the slow extraordinary wave (z mode) caused by a tenuous population of energetic electrons, n(e), in the presence of a weak magnetic field and a cold plasma background, n(0), is investigated. The growth rate of the z mode was calculated within linear Vlasov theory and assuming that, for a weak magnetic field, the growth rate coincides with that of the electrostatic Langmuir wave, i.e., when the magnetic field is neglected for the cold background but retained for the energetic electrons. The analytical expression for the case of a thermal beam is deduced and numerically evaluated for some typical solar wind plasma conditions. The effects of the beam density, direction of propagation, and magnetic field on the observable polarization is discussed.

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