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首页> 外文期刊>Planetary and space science >Effect of general loss-cone distribution function on the shear-driven electrostatic ion-cyclotron instability
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Effect of general loss-cone distribution function on the shear-driven electrostatic ion-cyclotron instability

机译：一般损失圆锥分布函数对剪切驱动静电离子回旋加速器不稳定性的影响

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摘要

The shear-driven electrostatic ion-cyclotron instability (EICI) is studied using the loss-cone distribution function by particle aspect analysis. The effect of the loss-cone distribution on the dispersion relation and growth rate of weak shear-driven EICI is studied. The whole plasma is considered to consist of resonant and non-resonant particles. The wave is assumed to propagate obliquely to the static magnetic field. It is found that the frequency of the EICI is Doppler shifted due to the transverse inhomogeneous flow in the direction of the magnetic field. It is also found that for anisotropic plasma the critical velocity shear needed to excite EICI depends upon the loss-cone distribution index (J). With the increasing values the loss-cone distribution indices (J), the critical value of normalized velocity shear needed to generate EICI in anisotropic plasma, decreases and is of the order of the weak shear. The loss-cone distribution acts as a source of free energy and generates the weak shear-driven EICI at longer perpendicular perturbations. It also lowers the transverse and parallel energy of the resonant ions. The study may explain the frequently observed EICI in the auroral acceleration region.
机译：利用损耗锥分布函数，通过颗粒长宽比分析研究了剪切驱动的静电离子回旋加速器不稳定性（EICI）。研究了损失锥分布对弱剪切驱动EICI的色散关系和生长速率的影响。整个等离子体被认为由共振和非共振粒子组成。假设该波倾斜地传播到静磁场。发现由于沿磁场方向的横向不均匀流动，EICI的频率被多普勒频移。还发现，对于各向异性等离子体，激发EICI所需的临界速度剪切取决于损耗圆锥分布指数（J）。随着值的增加，损失圆锥分布指数（J），在各向异性等离子体中生成EICI所需的归一化速度剪切的临界值会减小，并处于弱剪切的数量级。损耗锥分布充当自由能量的来源，并在较长的垂直扰动下产生弱剪切驱动的EICI。它还降低了共振离子的横向和平行能。该研究可以解释在极光加速区域经常观察到的EICI。

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