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The Solitary Dispersive Alfvén Wave in a Plasma with Two Distinct Electron Groups

  • PLASMA DYNAMICS
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Abstract

The electromagnetic polarization and the nonlinear soliton structure of dispersive Alfvén waves (DAWs) in a plasma with two different electron groups are investigated from the viewpoint multi-component fluid theory where the hot superthermal electron component is modeled by the kappa distribution. With the increase in the cold electron concentration, the electromagnetic polarization of DAW changes from the ones similar to the kinetic Alfvén wave to the ones similar to the inertial Alfvén wave. Meanwhile, the influence of the superthermal spectral index \(\kappa \) on the properties of DAW is reduced. Under the small amplitude assumption we find that there will be a soliton structure with positive potential amplitude. Correspondingly, the density of superthermal electrons will increase, while the density of cold electrons is decreased. But the total density variation strongly depends on the soliton velocity, the concentration of the cold electrons, and the value of kappa. The plausible application to the plasma sheet boundary layer is discussed from the numerical calculation of the nonlinear governing equation.

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Funding

This work was supported by the International S&T Cooperation Program of China (no. 2015DFA61800), National Key Research and Development Program of China (2016YFD0600703-1).

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Authors and Affiliations

  1. School of Sciences, Nantong University, 226019, Nantong, China

    Y. Liu & B. Gong

  2. College of Science, Nanjing Forestry University, 210037, Nanjing, China

    T.-P. Hu

Authors
  1. Y. Liu
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  2. B. Gong
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  3. T.-P. Hu
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Correspondence to Y. Liu.

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Liu, Y., Gong, B. & Hu, TP. The Solitary Dispersive Alfvén Wave in a Plasma with Two Distinct Electron Groups. Plasma Phys. Rep. 47, 715–724 (2021). https://doi.org/10.1134/S1063780X21070126

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