Excitation of electron acoustic waves near the electron plasma frequency and at twice the plasma frequency

Details Excitation of electron acoustic waves near the electron plasma frequency and at twice the plasma frequency Excitation of electron acoustic waves near the electron plasma frequency and at twice the plasma frequency

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10512919s&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A6, p. 12919-12928

Physics

Plasma Physics

22

Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Waves And Instabilities

Scientific paper

In this paper we investigate the nonlinear development of the electron acoustic instability that can lead to the transfer of wave energy to frequencies just above the electron plasma frequency (ωpe) and to waves with approximately twice the electron plasma frequency (2ωpe). Using plasma conditions in the upstream electron foreshock region based on data from the AMPTE-UKS spacecraft, an electron beam is considered in plasma containing a background of hot and cold electrons. This leads to the linear excitation of large-amplitude electron acoustic waves at frequencies between about 0.8 and 1.0ωpe. A modified decay instability then excites waves in the spectrum just above ωpe. This is followed by a second nonlinear coalescence process that causes the excitation of waves at frequencies just below 2ωpe. The linear and nonlinear properties of the electron acoustic instability are examined for observed conditions using analytical theory, particle-in-cell simulations, and Vlasov simulations. These results have application to observations made inside the electron foreshock region, as well as the polar cap and auroral zone, where plasma oscillations and waves at 2ωpe are observed.

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