Ion Dynamics during the Parametric Instabilities of a Left-hand Polarized Alfvén Wave in a Proton-Electron-Alpha Plasma

Xinliang Gao, Quanming Lu, Xing Li, Yufei Hao, Xin Tao, Shui Wang

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13 Citations (Scopus)
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Abstract

The parametric instabilities of an Alfvén wave in a proton-electron plasma system are found to have great influence on proton dynamics, where part of the protons can be accelerated through the Landau resonance with the excited ion acoustic waves, and a beam component along the background magnetic field is formed. In this paper,with a one-dimensional hybrid simulation model, we investigate the evolution of the parametric instabilities of a monochromatic left-hand polarized Alfvén wave in a proton-electron-alpha plasma with a low beta. When the drift velocity between the protons and alpha particles is sufficiently large, the wave numbers of the backward daughter Alfvén waves can be cascaded toward higher values due to the modulational instability during the nonlinear evolution of the parametric instabilities, and the alpha particles are resonantly heated in both the parallel and perpendicular direction by the backward waves.On the other hand, when the drift velocity of alpha particles is small,the alpha particles are heated in the linear growth stage of the parametric instabilities due to the Landau resonance with the excited ion acoustic waves. Therefore, the heating occurs only in the parallel direction, and there is no obvious heating in the perpendicular direction. The relevance of our results to the preferential heating of heavy ions observed in the solar wind within 0.3 AU is also discussed in this paper.
Original languageEnglish
Article number56
Pages (from-to)1-8
Number of pages8
JournalAstrophysical Journal
Volume780
Issue number1
Early online date11 Dec 2013
DOIs
Publication statusPublished - 01 Jan 2014

Keywords

  • method: numerical
  • plasmas
  • solar wind
  • waves

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