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题名: Cosmic Ray Diffusion Tensor throughout the Heliosphere Derived from a Nearly Incompressible Magnetohydrodynamic Turbulence Model
作者: Zhao, L. -L.; Adhikari, L.; Zank, G. P.; Hu, Q.; Feng, X. S.
作者部门: 空间科学部
通讯作者: Zhao, LL (reprint author), Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China. ; Zhao, LL (reprint author), Univ Alabama, CSPAR, Huntsville, AL 35805 USA.
关键词: cosmic rays ; diffusion ; solar wind ; turbulence
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 849, 期号:2, 页码:88
收录类别: SCI
项目资助者: National Science Foundation of China [41504133, 41531073, 41304137] ; China Scholarship Council ; NASA grant [NNX08AJ33G, 37102-2, NNX14AC08G, NNX14AJ53G, A99132BT, RR185-447/4944336, NNX12AB30G, NNX17AB85G] ; International Space Science Institute (ISSI) ; SAO [SV4-84017]
英文摘要: The radial and rigidity dependence of the cosmic ray (CR) diffusion tensor is investigated on the basis of a recently developed 2D and slab turbulence transport model using nearly incompressible theory. We study CR diffusion coefficients in two regions: 0.29 to 1 au, and 1 to 75 au. In the former case, we use 2D and radial slab turbulence transport models, and in the latter case, 2D and perpendicular slab turbulence transport models. We employ quasi-linear theory and nonlinear guiding center theory, respectively, to determine the parallel and perpendicular elements of the CR diffusion tensor. We also present the effect of both weak and moderately strong turbulence on the drift element of the CR diffusion tensor. We find that in the solar wind ecliptic plane (1) the radial mean free path (mfp) is dominated by diffusion parallel to the mean magnetic field and is nearly constant from 0.29 to 1 au; (2) from 1 to 75 au, the role of the perpendicular mfp becomes increasingly important despite the parallel mfp being about three orders of magnitude larger than the perpendicular mfp. The radial mfp initially decays slowly and then faster after similar to 6 au; (3) beyond similar to 10 au, pickup-ion-driven turbulence is the most important factor in determining the various mean free paths since stream interactions weaken with increasing heliocentric distance; (4) the rigidity (P) dependence of the parallel mfp is proportional to P-0.33 from 10 to 10(3) MV, but in the distant heliosphere, its dependence increases for higher rigidities and is proportional to P-2.0. In contrast, the perpendicular mfp is weakly influenced by CR rigidity; (5) the drift length scale is comparable to the perpendicular mfp beyond similar to 10 au; and (6) strong turbulence may introduce a new "drift" component, the direction of which is normal to the mean magnetic field.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6067
Appears in Collections:空间科学部_期刊论文

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