Nonlinear Modulation of Plasma Waves

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概要

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• Nonlinear modulation of waves in a cold plasma is investigated with a modification of a perturbation method developed by Taniuti and Yajima. In particular, it is shown that a modulated electron-cyclotronwave is influenced by a show motion of the plasma and that there is a critical wavenumber for the onset of modulational instability. The critical wavenumber is found to be independent of the direction of propagation, i.e., k_<crit>=ω_<pe>/c√<3>, where ω_<pe> and c are the plasma frequency and the light velocity, respectively. A lower hybrid wave, which propagates perpendicular to a uniform magnetic field, is shown to be stable against the wave modulation and in the limit of small wavenumber the modulated wave is an oscillatory solution of the Korteweg-de Vries equation obtained by Gardner and Morikawa.

• 核融合科学研究所の論文

著者

• KAKO Masashi

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kako Masashi

  Research Information Center Institute Of Plasma Physics Nagoya University

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