Linear analysis of ion cyclotron interaction in a multicomponent plasma
Linear analysis of ion cyclotron interaction in a multicomponent plasma
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多组分等离子体中离子回旋相互作用的线性分析
DOI：
10.1029/ja089ia10p09119
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发表时间：
1984
影响因子：
--
通讯作者：
K. Quest
中科院分区：
文献类型：
--
作者：
R. Gendrin;M. Ashour‐Abdalla;Y. Omura;K. Quest
定量研究了热各向异性质子在含冷H（+）和He（+）离子等离子体中产生电磁离子回旋波的机理。计算了不同等离子体参数（冷He（+）离子和热质子的浓度、温度和各向异性）下的线性增长率（时间和空间）。结果表明：(1)对于地球静止高度的典型参数，当存在少量（约1% ~ 20%）冷He（+）离子时，最大增长率不会发生剧烈变化；(2)由于He（+）陀螺频率附近热He（+）离子的重要回旋吸收，不能产生与He（+）分布主体共振的波。因此，准线性效应，至少在均匀介质中，不能对He（+）离子的加热负责，这种加热通常与离子回旋波一起观察到。研究了生长速率随波数的变化规律，指出了其在数值模拟实验中选择合适参数的重要性。
The mechanism by which hot anisotropic protons generate electromagnetic ion cyclotron waves in a plasma containing cold H(+) and He(+) ions is quantitatively studied. Linear growth rates (both temporal and spatial) are computed for different plasma parameters: concentration, temperature,and anisotropy of cold He(+) ions and of hot protons. It is shown that: (1) for parameters typical of the geostationary altitude the maximum growth rates are not drastically changed when a small proportion (about 1 to 20 percent) of cold He(+) ions is present; (2) because of the important cyclotron absorption by thermal He(+) ions in the vicinity of the He(+) gyrofrequency, waves which could resonate with the bulk of the He(+) distribution cannot be generated. Therefore quasi-linear effects, in a homogeneous medium at least, cannot be responsible for the heating of He(+) ions which is often observed in conjunction with ion cyclotron waves. The variation of growth rate versus wave number is also studied for its importance in selecting suitable parameters in numerical simulation experiments.