A mechanism for plasma waves at the harmonics of the plasma frequency in the electron foreshock boundary

Details A mechanism for plasma waves at the harmonics of the plasma frequency in the electron foreshock boundary A mechanism for plasma waves at the harmonics of the plasma frequency in the electron foreshock boundary

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9081k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9081-9091.

Physics

40

Electron Density (Concentration), Harmonic Excitation, Plasma Frequencies, Plasma Waves, Velocity Distribution, Electric Fields, International Sun Earth Explorer 1, Landau Damping, Maxwell Equation, Power Spectra, Vlasov Equations

Scientific paper

A bump-on-tail unstable reduced velocity distribution, constructed from data obtained at the upstream boundary of the electron foreshock by the GSFC electron spectrometer experiment on the ISEE-1 satellite, is used as the initial plasma state for a numerical integration of the 1D-Vlasov-Maxwell system of equations. The integration is carried through the growth of the instability, beyond its saturation, and well into the stabilized plasma regime. A power spectrum computed for the electric field of the stabilized plasma is dominated by a narrow peak at the Bohm-Gross frequency of the unstable field mode but also contains significant power at the harmonics of the Bohm-Gross frequency. The harmonic power is in sharp peaks which are split into closely spaced doublets. The fundamental peak at the Bohm-Gross frequency is split into a closely spaced triplet. The mechanism for excitation of the second harmonic is shown to be second order wave-wave coupling. Previously announced in STAR as N83-17315

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