论文标题
在空间等离子体中刺激的电磁离子不稳定性刺激的电磁离子不稳定性：准线性方法
Electromagnetic ion cyclotron instability stimulated by the suprathermal ions in space plasmas: A quasi-linear approach
论文作者
论文摘要
在贫困的空间等离子体中，垂直于背景磁场的方向上的动能过量或温度过高会激发电磁离子回旋子（EMIC）的不稳定性。预计这种不稳定性对质子的质子高度敏感，从而增强了观察到的速度分布的高能尾巴，并由（BI-）KAPPA分布函数很好地再现。在本文中，我们介绍了一种精制的准线性（QL）方法的结果，能够描述超颗粒质子对EMIC不稳定性的扩展时间演变的影响。因此，表明近心伴侣对EMIC的不稳定性具有系统的刺激作用，不仅提高了生长速率和不稳定波数的范围，而且还提高了饱和度达到的磁波动密度。实际上，各向异性温度的松弛也变得更加有效，即时间更快，更接近各向同性。
In collision-poor space plasmas protons with an excess of kinetic energy or temperature in direction perpendicular to background magnetic field can excite the electromagnetic ion cyclotron (EMIC) instability. This instability is expected to be highly sensitive to suprathermal protons, which enhance the high-energy tails of the observed velocity distributions and are well reproduced by the (bi-)Kappa distribution functions. In this paper we present the results of a refined quasilinear (QL) approach, able to describe the effects of suprathermal protons on the extended temporal evolution of EMIC instability. It is thus shown that suprathermals have a systematic stimulating effect on the EMIC instability, enhancing not only the growth rates and the range of unstable wave-numbers, but also the magnetic fluctuating energy density reached at the saturation. In effect, the relaxation of anisotropic temperature becomes also more efficient, i.e., faster in time and closer to isotropy.
