Numerical simulation of the weak turbulence excited by a beam of electrons in the interplanetary plasma

Details Numerical simulation of the weak turbulence excited by a beam of electrons in the interplanetary plasma Numerical simulation of the weak turbulence excited by a beam of electrons in the interplanetary plasma

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..173g&link_type=abstract

Solar Physics, vol. 81, Nov. 1982, p. 173-180.

Physics

46

Plasma Spectra, Plasma Turbulence, Plasma-Particle Interactions, Solar Electrons, Space Plasmas, Type 3 Bursts, Computerized Simulation, Electron Beams, Electron Distribution, High Energy Electrons, International Sun Earth Explorer 3, Plasma Waves, Plasmons, Solar Wind, Spectral Energy Distribution, Wave Scattering

Scientific paper

The electron distribution functions measured at 1 AU in an electron stream passing the ISEE-3 spacecraft (Lin et al., 1981) are used as input data to a programme which simulates in a one-dimensional model the interaction between fast electrons and plasma waves (`quasi-linear' relaxation) together with the plasma wave scattering off the background ions. While the computed spectral energy density of the plasma waves excited in resonance with the streaming of electrons is below Zakharov's threshold of strong turbulence, it is sufficiently high to undergo a fast induced scattering off the background ions. The resulting spectrum is concentrated around the wave vector k = 0. Some simple analytic considerations show that this stage leads necessarily to the crossing of Zakharov's threshold and therefore this indirect excitation of strong turbulence seems to play an essential role in understanding the Langmuir turbulence generated by the motion of fast electron beams in the interplanetary plasma.

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