Parametric Instabilities of Parallel Propagating Circularly Polarized Alfven Waves:One-Dimensional Hybrid Simulations  

作　　者：何鹏 高新亮 陆全明 赵金松 

机构地区：[1]CAS Key Laboratory of Ceospace Environment, Department of Ceophysics and Planetary Science, University of Science and Technology of China, Hefei 230026 [2]Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008

出　　处：《Chinese Physics Letters》2015年第11期85-91,共7页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 41331067,41474125,41274144,41174124 and 41121003;the National Basic Research Program of China under Grant Nos 2013CBA01503 and 2012CB825602;the Key Research Program of Chinese Academy of Sciences under Grant No KZZD-EW-01-4

摘　　要：By performing one-dimensional （l-D） hybrid simulations, we analyze in detail the parametric instabilities of the Alfv^n 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 Alfv6n waves. In the second stage, each pump Alfv^n wave decays into a density mode and a daughter Alfv6n mode similar to the monochromatic cases. Ftlrthermore, 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.By performing one-dimensional （l-D） hybrid simulations, we analyze in detail the parametric instabilities of the Alfv^n 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 Alfv6n waves. In the second stage, each pump Alfv^n wave decays into a density mode and a daughter Alfv6n mode similar to the monochromatic cases. Ftlrthermore, 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.

关 键 词：Parametric Instabilities of Parallel Propagating Circularly Polarized Alfven Waves:One-Dimensional Hybrid Simulations FIGURE 

分 类 号：O53[理学—等离子体物理]