Parametric Instabilities of Parallel Propagating Circularly Polarized Alfvén Waves: One-Dimensional Hybrid Simulations
HE Peng1 , GAO Xin-Liang1** , LU Quan-Ming1 , ZHAO Jin-Song2
1 CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 2300262 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
Abstract :By performing one-dimensional (1-D) hybrid simulations, we analyze in detail the parametric instabilities of the Alfvén waves with a spectrum in a low beta plasma. The parametric instabilities experience two stages. In the first stage, the density modes are excited and immediately couple with the pump Alfvén waves. In the second stage, each pump Alfvén wave decays into a density mode and a daughter Alfvén mode similar to the monochromatic cases. Furthermore, the proton velocity beam will also be formed after the saturation of the parametric instabilities. When the plasma beta is high, the parametric decay in the second stage will be strongly suppressed.
收稿日期: 2015-07-10
出版日期: 2015-12-01
:
52.35.Mw
(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
94.05.Pt
(Wave/wave, wave/particle interactions)
52.65.Ww
(Hybrid methods)
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