Growth of electron plasma waves above and below f(p) in the electron foreshock

Details Growth of electron plasma waves above and below f(p) in the electron foreshock Growth of electron plasma waves above and below f(p) in the electron foreshock

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7307c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7307-7317.

Computer Science

Sound

25

Electron Beams, Electron Plasma, Electrostatic Waves, Plasma Frequencies, Plasma Waves, Shock Waves, Electron Energy, Numerical Analysis, Sound Waves

Scientific paper

This paper investigates the conditions required for electron beams to drive wave growth significantly above and below the electron plasma frequency, f(p), by numerically solving the linear dispersion equation. It is shown that kinetic growth well below f(p) may occur over a broad range of frequencies due to the beam instability, when the electron beam is slow, dilute, and relatively cold. Alternatively, a cold or sharp feature at low parallel velocities in the distribution function may drive kinetic growth significantly below f(p). Kinetic broadband growth significantly above f(p) is explained in terms of faster warmer beams. A unified qualitative theory for the narrow-band and broad-band waves is proposed.

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