Ion-acoustic-like waves excited by the reflected ions at the earth's bow shock

Details Ion-acoustic-like waves excited by the reflected ions at the earth's bow shock Ion-acoustic-like waves excited by the reflected ions at the earth's bow shock

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012095a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,095-12,103.

Physics

23

Bow Waves, Earth Atmosphere, Electrostatic Waves, Ion Acoustic Waves, Plasma Frequencies, Shock Waves, Anisotropy, Electron Distribution, Ion Distribution, Magnetohydrodynamic Stability, Solar Wind

Scientific paper

Some model distributions based on recent observations and simulations of the plasma at the earth's bow shock are found to be unstable to obliquely propagating electrostatic instabilities. The model distributions consist of either an ion beam or an ion velocity ring accompanied by a bi-Maxwellian background ion distribution and a flattop electron distribution. Ion anisotropies and nonthermal electrons are capable of significantly lowering the threshold of the ion beam instability. The generated waves share many properties in common with the ion acoustic waves that have been observed at the earth's bow shock. The results also indicate the importance of an anisotropy in the background ion velocity distribution in identifying sources of the ion-acoustic-like waves observed in the ion foreshock and the solar wind.

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