Cosmic Ray Diffusion Tensor throughout the Heliosphere Derived from a Nearly Incompressible Magnetohydrodynamic Turbulence Model
文献类型：期刊论文
| 作者 | Zhao, L. -L.; Adhikari, L.; Zank, G. P.; Hu, Q.; Feng, X. S.; 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. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017 |
| 卷号 | 849期号:2页码:88 |
| 关键词 | Cosmic Rays Diffusion Solar Wind Turbulence |
| ISSN号 | 0004-637X |
| 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 |
| 资助机构 | 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] |
| 源URL | [http://ir.nssc.ac.cn/handle/122/6067]  |
| 专题 | 国家空间科学中心_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. |
| 推荐引用方式 GB/T 7714 | Zhao, L. -L.,Adhikari, L.,Zank, G. P.,et al. Cosmic Ray Diffusion Tensor throughout the Heliosphere Derived from a Nearly Incompressible Magnetohydrodynamic Turbulence Model[J]. ASTROPHYSICAL JOURNAL,2017,849(2):88. |
| APA | Zhao, L. -L..,Adhikari, L..,Zank, G. P..,Hu, Q..,Feng, X. S..,...&Zhao, LL .(2017).Cosmic Ray Diffusion Tensor throughout the Heliosphere Derived from a Nearly Incompressible Magnetohydrodynamic Turbulence Model.ASTROPHYSICAL JOURNAL,849(2),88. |
| MLA | Zhao, L. -L.,et al."Cosmic Ray Diffusion Tensor throughout the Heliosphere Derived from a Nearly Incompressible Magnetohydrodynamic Turbulence Model".ASTROPHYSICAL JOURNAL 849.2(2017):88. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。