Beam-driven electron acoustic waves upstream of the earth's bow shock

Details Beam-driven electron acoustic waves upstream of the earth's bow shock Beam-driven electron acoustic waves upstream of the earth's bow shock

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6327m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6327-6336.

Physics

40

Electroacoustic Waves, Electrostatic Waves, Plasma-Particle Interactions, Shock Waves, Solar Wind, Space Plasmas, Magnetohydrodynamic Stability, Plasma Frequencies, Wave Dispersion

Scientific paper

Upstream of the earth's bow shock, intense electrostatic waves are frequently observed in association with energetic ions and electrons. Various theories have been considered to explain the 'ion-acoustic-like' electrostatic short-wavelength noise upstream of the earth's bow shock. The present investigation is concerned with a possible alternative and/or complement to these theories. It is demonstrated that an ion beam drifting at about the electron thermal speed is able to excite waves below and in the vicinity of the electron plasma frequency. The obtained results are in general agreement with the conclusions of a study conducted by Grabbe and Eastman (1984), who explained that the broadband electrostatic noise observed in the earth's magnetotail is generated by an ion beam instability. The electrostatic dispersion relation is discussed for Maxwellian and Lorentzian distributions.

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