随机磁场中的反常扩散效应

本文讨论了随机磁场中反常扩散效应的特征,导出了扩散流及电场随时间变化的公式,指出,趋向于稳态所需的时间远小于粒子约束时间,因而反常扩散基本上是准稳态的形式。此时,存在明显的双极电场,而双极扩散流基本上是离子扩散的量级。关键词：

THE ANOMALOUS DIFFUSION EFFECT IN A STOCHASTIC MAGNETIC FIELD

In this paper the effects of diffusion in a stochastic magnetic field are discussed. The time-dependent equations for diffusion flux and ambipolar electric field are derived. The results show that the relaxation time is much less than the life-time of particles, so that the quasi-stationary state can be reached. The ambipolar electric field is important and the ambipolar diffusion flux is of the same order of the ion diffusion level.