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首页> 外文期刊>Journal of Plasma Physics >Compressive high-frequency waves riding on an Alfvén/ion-cyclotron wave in a multi-fluid plasma
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Compressive high-frequency waves riding on an Alfvén/ion-cyclotron wave in a multi-fluid plasma

机译：多流体等离子体中的Alfvén/离子回旋加速器波上的压缩高频波

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摘要

In this paper, we study the weakly-compressive high-frequency plasma waves which are superposed on a large-amplitude Alfvén wave in a multi-fluid plasma consisting of protons, electrons, and alpha particles. For these waves, the plasma environment is inhomogenous due to the presence of the low-frequency Alfvén wave with a large amplitude, a situation that may apply to space plasmas such as the solar corona and solar wind. The dispersion relation of the plasma waves is determined from a linear stability analysis using a new eigenvalue method that is employed to solve the set of differential wave equations which describe the propagation of plasma waves along the direction of the constant component of the Alfvén wave magnetic field. This approach also allows one to consider weak compressive effects. In the presence of the background Alfvén wave, the dispersion branches obtained differ significantly from the situation of a uniform plasma. Due to compressibility, acoustic waves are excited and couplings between various modes occur, and even an instability of the compressive mode. In a kinetic treatment, these plasma waves would be natural candidates for Landau-resonant wave-particle interactions, and may thus via their damping lead to particle heating.
机译：在本文中，我们研究了弱压缩的高频等离子体波，该等离子体波在质子，电子和α粒子组成的多流体等离子体中叠加在大振幅Alfvén波上。对于这些波，由于存在大振幅的低频Alfvén波，等离子体环境是不均匀的，这种情况可能适用于空间等离子体，例如太阳电晕和太阳风。使用新的特征值方法通过线性稳定性分析确定等离子体波的色散关系，该特征值方法用于解决一组差分波方程，该方程描述了等离子体波沿Alfvén波磁场的恒定分量方向的传播。这种方法还可以考虑弱的压缩作用。在背景Alfvén波的存在下，获得的分散分支与均匀等离子体的情况有很大不同。由于可压缩性，声波被激发并且各种模式之间发生耦合，甚至压缩模式的不稳定性。在动力学处理中，这些等离子体波将自然成为Landau共振波-粒子相互作用的候选者，因此可能会通过其阻尼导致粒子加热。

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