Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.5159s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, June 1, 1985, p. 5159-5172.
Physics
18
Electron Beams, Nonuniform Plasmas, Plasma-Particle Interactions, Wave Excitation, Gyrofrequency, Hydrogen Ions, Ion Cyclotron Radiation, Positive Ions
Scientific paper
It is pointed out that electrostatic ion cyclotron (EIC) waves have been extensively investigated in connection with both space and laboratory plasmas. The present investigation has the objective to study the excitation of low-frequency waves in a multiion plasma by electron beams. The frequencies considered range from below the lowest gyrofrequency of the heaviest ion to about the lower hybrid frequency. It is shown that electron-beam instabilities can produce peaks in the growth rate below the cyclotron frequency of each ion species if nonzero perpendicular wave number effects are included in the ion dynamics. The dispersion relations for neutralized ion Bernstein (NIB) and pure ion Bernstein (PIB) waves are considered along with an instability analysis for a cold plasma and warm electron beam, the electron beam-plasma mode, banded ion cyclotron (EIC) waves with small perpendicular wavelengths, and the growth lengths of the waves.
Conrad J. R.
Schunk Robert W.
Singh Navinder
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