Ion pitch-angle scattering by Alfven waves

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题名:	Ion pitch-angle scattering by Alfven waves
作者:	Li,Y;Yoon,PH;Wu,CS;Weatherwax,AT;Chao,JK;Wu,BH
贡献者:	太空科學研究所
关键词:	STRONG HYDROMAGNETIC TURBULENCE;COMET GIACOBINI-ZINNER;PICK-UP IONS;SOLAR-WIND;NEWBORN IONS;ELECTROMAGNETIC INSTABILITIES;INTERSTELLAR HYDROGEN;COMPUTER-SIMULATIONS;VELOCITY DIFFUSION;LOW-FREQUENCY
日期:	1997
上传时间:	2010-06-29 18:39:16 (UTC+8)
出版者:	中央大學
摘要:	Freshly created ions can be picked up by a moving plasma without relying on collisions. It is well known that such an ion pickup process can be accomplished via the interaction with Alfven waves. However, it should be stressed that in generation pickup is attributed to two distinctly different sub-processes, namely, pitch-angle diffusion and pitch-angle scattering. In this article their difference is discussed and furthermore, some new results from a recent theoretical study are reported. It is found that under some conditions the usual quasilinear theory which describes the pitch-angle diffusion process cannot be justified even when the turbulence level is low. Another significant finding is that in the presence of strong Alfven turbulence, thermal ions can be intensely heated by a nonlinear damping of the waves, which does not depend upon the usual ion cyclotron resonance. (C) 1997 American Institute of Physics. [S1070-664X(97)00111-0].
關聯:	PHYSICS OF PLASMAS
显示于类别:	[太空科學研究所 ] 期刊論文

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