Pitch-angle diffusion of ions via nonresonant interaction with Alfvenic turbulence
Pitch-angle diffusion of ions via nonresonant interaction with Alfvenic turbulence
复制标题
DOI：
10.1063/1.3236749
复制
发表时间：
2009-10
影响因子：
2.2
通讯作者：
P. Yoon;C. B. Wang;C. Wu
中科院分区：
文献类型：
--
作者：
P. Yoon;C. B. Wang;C. Wu
本文重新讨论阿尔文湍流对离子的非共振加热问题。结果表明，在弱Alfvenic湍流的限制下，用垂直赝热来描述质子的非共振加热是合适的。然而，在一个更一般的情况下，它表明，更合适的观点的非共振加热过程是在波帧的俯仰角散射。本文的目的是把早期的理论推广到湍流阿尔芬波的能量密度不一定很低的情况。对于弱湍流情况，本分析证实了Wu和Yoon的早期发现[Phys. Rev. Lett. 99，075001（2007）]，根据他，非共振阿尔芬波加热被描述为导致质子的垂直伪加热。然而，在更一般的情况下，本文论证了俯仰角散射在阿尔芬波伪加热过程中起主要作用，并由此得出结论。
The present discussion revisits the problem of nonresonant heating of ions by Alfvenic turbulence. It is shown that in the limit of weak Alfvenic turbulence it is appropriate to describe the nonresonant heating of protons as perpendicular pseudoheating. However, in a more general situation it is demonstrated that the more appropriate view of the nonresonant heating process is the pitch-angle scattering in the wave frame. The purpose of this paper is to generalize the earlier theory to the case in which the energy density of the turbulent Alfven waves is not necessarily very low. For weakly turbulent situation the present analysis confirms the earlier finding by Wu and Yoon [Phys. Rev. Lett. 99, 075001 (2007)], according to whom the nonresonant Alfven wave heating is described as leading to perpendicular pseudoheating of the protons. However, for more general situation the present paper demonstrates that pitch-angle scattering plays the principal role in the Alfven wave pseudoheating process, and thereby s...