Parametric instabilities of circularly polarized Alfvén waves in a relativistic electron-positron plasma.
Parametric instabilities of circularly polarized Alfvén waves in a relativistic electron-positron plasma.
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相对论电子-正电子等离子体中圆偏振阿尔文波的参数不稳定性。
DOI：
10.1103/physreve.67.046406
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Hada
中科院分区：
文献类型：
--
作者：
S. Matsukiyo;T. Hada
用理论和数值方法研究了相对论正负电子等离子体中圆偏振Alfvén波的色散关系和参量不稳定性的非线性演化。在非相对论极限下，当2 ω（2）（p）> ω 20时，不稳定性的特征与电子-离子等离子体中的不稳定性相似，只是当v（2）（s）<ω（2）（0）/k（2）（0）时才发生调制不稳定性，其中ω（p）和v（s）表示等离子体频率和声速，ω（0），k（0）表示母波的频率和波数。另一方面，当2 ω（2）（p）<ω 20时，在平行或反平行传播的类阿尔文波和平行传播的类朗缪尔波之间出现两种新的不稳定性。讨论了所有不稳定性的弱相对论效应。一维全粒子模拟和模拟结果的双相干分析表明，通过平行传播的类朗缪尔波和反平行传播的类阿尔芬波相互作用的连续衰变可以有效地产生连续的低频电磁波，这些电磁波可以与高能粒子相互作用.
Dispersion relation and nonlinear evolution of the parametric instabilities of circularly polarized Alfvén waves in a relativistic electron-positron plasma are investigated by theoretical and numerical approaches. In the nonrelativistic limit, when 2omega(2)(p)>omega20, the characteristics of the instabilities are similar to those in an electron-ion plasma, except that the modulational instability takes place only if v(2)(s)<omega(2)(0)/k(2)(0), where omega(p) and v(s) denote the plasma frequency and the acoustic speed, and omega(0), k(0) indicate the frequency and the wave number of the parent wave. On the other hand, when 2omega(2)(p)<omega20, two new types of instabilities emerge between the parallel or antiparallel propagating Alfvén-like waves and the parallel propagating Langmuir-like wave. The weakly relativistic effect is discussed for all the instabilities. The one-dimensional full particle simulation and bicoherence analysis of the simulation result suggest that successive decay via the interaction between the parallel propagating Langmuir-like wave and antiparallel propagating Alfvén-like wave can efficiently generate a continuum of low frequency electromagnetic waves, which can interact with energetic particles.