KdV Equations for High- and Low-Frequency Magnetosonic Waves in a Multi-Ion Plasma

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概要

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• Investigations are made of nonlinear magnetosonic waves propagating perpendicular to a magnetic field in a multi-ion plasma. The magnetosonic wave is split into two modes in a two-ion plasma ; low- and high-frequency modes. The frequency of the low-frequency mode tends to zero as the wave number k goes to zero. A KdV equation is derived for this mode by the conventional reductive perturbation method. The frequency of the high-frequency mode does not tend to zero as k→0. Using a new expansion scheme in which the amplitude ε is assumed to be much larger than (m_e/m_i)^<1/2>, where m_e/m_i is a measure of electron-to-ion mass ratios, it is found that the nonlinear high-frequency mode can also be described by a KdV equation, although it has a finite cut-off frequency. This shows that KdV equations are not limited to the waves whose frequencies tend to zero as k→0.

• 社団法人日本物理学会の論文
• 1994-02-15

著者

• Toida Mieko

  Plasma Science Center, Nagoya University

• Toida Mieko

  Plasma Science Center Nagoya University

• Ohsawa Yukiharu

  Plasma Science Center Nagoya University

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• Ion Ring Distribution Produced by a Magnetosonic Wave
• KdV Equations for High- and Low-Frequency Magnetosonic Waves in a Multi-Ion Plasma
• Electron Motion in a Nonlinear Magnetosonic Wave Propagating Perpendicularly to a Magnetic Field
• Elemental Compositions of High-Energy Ions Produced by Magnetosonic Waves in Quiescent Plasmas
• Heavy Ion Acceleration by Nonlinear Magnetosonic Waves in a Two-Ion-Species Plasma
• Unified Theory for Solar Energetic Particles : Basic Composition, ^3He-Rich Events, and Prompt Ion Acceleration

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