论文标题
有限电磁波的低频电磁波的陀螺仪理论 - $β$各向异性等离子体
Gyrokinetic Theory of Low-frequency Electromagnetic Waves in Finite-$β$ Anisotropic Plasmas
论文作者
论文摘要
我们为电磁波和不稳定性提供了一种旋转理论，其频率远低于有限$β$各向异性均匀等离子体中的离子回旋频率。在这里，$β$是等离子体和磁压之间的比率。由于有限的Larmor半径和波粒子共振引起的动力学效应在分析中完全保存。然后，针对Bi-Maxwellian等离子体专门得出了对一般$β$值和垂直波长有效的相应线性分散关系和波动极化。还提供了动力学和镜面不稳定性标准的分析表达式。然后，在一组参数的系统研究中对广泛模式的广泛模式的模式频率，稳定性和波动极化进行了研究。我们的研究清楚地表明，由于有限的离子Larmor半径效应，离子 - 声波，镜像模式和剪切alfven波是本质上耦合的。
We present a gyrokinetic theory for the electromagnetic waves and instabilities with frequencies much lower than the ion cyclotron frequency in finite-$β$ anisotropic uniform plasmas. Here, $β$ is the ratio between plasma and magnetic pressures. Kinetic effects due to both the finite Larmor radii and wave-particle resonances are fully kept in the analysis. Corresponding linear dispersion relation and wave polarizations, valid for general $β$ value and perpendicular wavelength, are then specifically derived for a bi-Maxwellian plasma. Analytic expressions for the criteria of kinetic firehose and mirror instabilities are also given. The mode frequency, stability, and wave polarization of a broad spectrum of normal modes are then investigated numerically in a systematic study over a set of parameters. Our study clearly demonstrates that, due to the finite ion Larmor radius effect, the ion-sound wave, mirror mode, and shear Alfven wave are intrinsically coupled.
