论文标题
外电子对电子声学不稳定性的影响
Effects of suprathermal electrons on electron-acoustic instabilities
论文作者
论文摘要
我们研究了具有两个Kappa分布电子和固定离子的等离子体中的电子声音不稳定性。不稳定性是由两个电子组件之间的相对漂移驱动的。分析了不同物种对生长速率和不稳定性阈值的影响，并通过数值计算进行比较。本研究表明，最可能的速度速度缓慢的外电子比具有最可能的速度快速发挥作用更重要。前者大大减少了不稳定性并提高了不稳定性阈值。这项研究中使用的参数是从地球磁性磁膜中的观测值中启发的。
We study the electron-acoustic instabilities in plasmas with two kappa-distributed electrons and stationary ions. The instabilities are driven by the relative drift between two electron components. The suprathermal effects of different species on growth rates and instability thresholds are analyzed and compared by numerical calculations. The present study reveals that the suprathermal electrons with slow most probable speed play more important roles than the suprathermal ones with fast most probable speed. The former significantly reduces the instabilities and raises the instability thresholds. The parameters used in this study are inspired from the observations in Earth's magnetopause.
