One- and two-dimensional simulations of electron beam instability: Generation of electrostatic and electromagnetic <formula alphabet="latin">2fp waves

Details One- and two-dimensional simulations of electron beam instability: Generation of electrostatic and electromagnetic <formula alphabet="latin">2fp waves One- and two-dimensional simulations of electron beam instability: Generation of electrostatic and electromagnetic <formula alphabet="latin">2fp waves

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10618693k&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A9, p. 18693-18712

Physics

25

Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Plasma Waves And Turbulence, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

We have performed computer simulations of the self-consistent nonlinear evolution of electrostatic and electromagnetic 2fp waves excited by electron beams with electromagnetic particle code. In both one- and two-dimensional periodic systems an electrostatic 2fp wave is generated at twice the wave number of forward propagating Langmuir waves by wave-wave coupling. This wave grows with the forward propagating Langmuir wave in the nonlinear stage of the simulations. The electrostatic 2fp wave in the simulations is saturated at about -20~-30dB of that of the Langmuir waves. It is larger than the value expected from observations in the terrestrial electron foreshock. The electromagnetic 2fp wave is only excited in two-dimensional systems. The magnitude of the electromagnetic 2fp wave is correlated with the backward propagating Langmuir wave, not with the electrostatic 2fp wave. This result suggests that the electromagnetic 2fp wave is excited by the wave-wave coupling of forward and backward propagating Langmuir waves. The typical power density estimated from a reasonable amplitude of Langmuir wave is of the same order or much weaker than the value typically observed around the electron foreshock.

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