在AGN风中离心诱导曲率漂移不稳定性的效率
Efficiency of the centrifugally induced curvature drift instability in AGN winds
摘要：
为了研究活动星系核风在轻圆柱表面附近的自由运动，如何使磁力线发生扭曲，本文对离心驱动的曲率漂移不稳定性进行了研究。研究了轻圆柱表面附近的相对论MHD流的动力学，采用基于离心加速度的单粒子方法，导出了不稳定性的色散关系，并进行了解析求解。考虑到活动星系核风的典型值，结果表明曲率漂移不稳定性的时间尺度远小于吸积过程的时间尺度，表明目前的不稳定性是非常有效的，并可能强烈地影响活动星系核等离子体中的过程。
英文摘要：
For studying how the field lines are twisting nearby the light cylinder surface, which provides the free motion of AGN winds through the mentioned area, the investigation of the centrifugally driven curvature drift instability is presented. Studying the dynamics of the relativistic MHD flow close to the light cylinder surface, by applying a single particle approach based on the centrifugal acceleration, the dispersion relation of the instability is derived and analytically solved. Considering the typical values of AGN winds, it is shown that the time scale of the curvature drift instability is much less than the accretion process time scale, indicating that the present instability is very efficient and might strongly influence processes in AGN plasmas.
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