Ion waves generated by streaming particles

Details Ion waves generated by streaming particles Ion waves generated by streaming particles

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3...73a&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 3, Jan.-Feb. 1985, p. 73-80.

Physics

2

Electron Beams, Electrostatic Waves, Gyrofrequency, Ion Acoustic Waves, Ion Beams, Propagation Modes, Bandwidth, Destabilization, Drift Rate, Electron Distribution, Plasmas (Physics)

Scientific paper

The wave modes with frequencies of the order of the ion gyrofrequency are surveyed for a broad range of electron temperatures and for all angles of propagation. The destabilization of some of these modes by ions or electrons drifting along the ambient magnetic field is studied by numerical methods. Narrowband electostatic emissions between multiples of the ion gyrofrequency and broadband ion-acoustic waves can be generated by streaming protons, oxygen ions, and electrons, even in the presence of some cool electrons. In the examples the wave spectra produced by drifting electrons are less sensitive to changes in the model parameters than spectra caused by streaming ions. The spectrum produced by an ion beam depends, for example, on the mass of the drifting ions and on the temperature of the electron distributions. These results are favorably compared with observations on auroral field lines of electrostatic waves and drifting particles.

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