Numerical investigation of the influence of large turbulence scales on the parallel and perpendicular transport of cosmic rays

	Numerical investigation of the influence of large turbulence scales on the parallel and perpendicular transport of cosmic rays
	Qin, G.; Shalchi, A.
刊名	ADVANCES IN SPACE RESEARCH
	2012
卷号	49 期号:12 页码:1643-1652
关键词	Magnetic fields Turbulence Energetic particles
ISSN号	0273-1177
通讯作者	Shalchi, A (reprint author), Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada.
中文摘要	In recent analytical investigations it has been demonstrated that the turbulence behavior at large scales has a very strong influence on the perpendicular diffusion coefficient of charged particles. In the present paper we use computer simulations to investigate numerically cross field transport and particle propagation along the mean magnetic field for different turbulence models at large scales. Our results are compared with quasilinear theory and nonlinear diffusion theories. We show that for different forms of the turbulence spectrum at large scales, the perpendicular mean free paths obtained numerically are in agreement with recent predictions made by analytical theory. It is also shown that the parallel diffusion coefficient contains always a strong nonlinear contribution which is, however, independent of the assumed spectrum at large scales. (C) 2012 COSPAR. Published by Elsevier Ltd. All rights reserved.
英文摘要	In recent analytical investigations it has been demonstrated that the turbulence behavior at large scales has a very strong influence on the perpendicular diffusion coefficient of charged particles. In the present paper we use computer simulations to investigate numerically cross field transport and particle propagation along the mean magnetic field for different turbulence models at large scales. Our results are compared with quasilinear theory and nonlinear diffusion theories. We show that for different forms of the turbulence spectrum at large scales, the perpendicular mean free paths obtained numerically are in agreement with recent predictions made by analytical theory. It is also shown that the parallel diffusion coefficient contains always a strong nonlinear contribution which is, however, independent of the assumed spectrum at large scales. (C) 2012 COSPAR. Published by Elsevier Ltd. All rights reserved.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	NNSFC [40921063, 41074125]; Natural Sciences and Engineering Research Council (NSERC) of Canada
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3190]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Qin, G.,Shalchi, A.. Numerical investigation of the influence of large turbulence scales on the parallel and perpendicular transport of cosmic rays[J]. ADVANCES IN SPACE RESEARCH,2012,49(12):1643-1652.
APA	Qin, G.,&Shalchi, A..(2012).Numerical investigation of the influence of large turbulence scales on the parallel and perpendicular transport of cosmic rays.ADVANCES IN SPACE RESEARCH,49(12),1643-1652.
MLA	Qin, G.,et al."Numerical investigation of the influence of large turbulence scales on the parallel and perpendicular transport of cosmic rays".ADVANCES IN SPACE RESEARCH 49.12(2012):1643-1652.