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题名: A NUMERICAL SIMULATION OF COSMIC RAY MODULATION NEAR THE HELIOPAUSE. II. SOME PHYSICAL INSIGHTS
作者: Luo, Xi; Potgieter, Marius S.; Zhang, Ming; Pogorelov, Nikolai V.; Feng, Xueshang; Strauss, R. du Toit
作者部门: 空间科学部
通讯作者: Luo, X (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, SIGMA Weather Grp, Beijing 100190, Peoples R China. ; Luo, X (reprint author), North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.
关键词: cosmic rays ; Sun: heliosphere
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2016
卷号: 826, 期号:2, 页码:182
收录类别: SCI
项目资助者: National Basic Research Program (973 program) [2012CB825601] ; Knowledge Innovation Program of the Chinese Academy of Sciences [KZZD-EW-01-4] ; National Natural Science Foundation of China [41231068, 41304137, 41274192, 41374188, 41531073, 41504132] ; Specialized Research Fund for State Key Laboratories ; post-doctoral programme of the North-West University in South Africa ; South African National Research Foundation (NRF) under the Incentive and Competitive Funding for Rated Researchers [87820, 68198] ; NASA [NNX12AB30G, NNX14AJ53G, NNX15AN72G, NNX14AF41G] ; NSF PRAC award [OCI-1144120] ; NASA High-End Computing Program award [SMD-11-2195] ; NSF XSEDE project [MCA07S033] ; International Space Science Institute in Bern, Switzerland
英文摘要: Cosmic ray (CR) transport near the heliopause (HP) is studied using a hybrid transport model, with the parameters constrained by observations from the Voyager 1 spacecraft. We simulate the CR radial flux along different directions in the heliosphere. There is no well-defined thin layer between the solar wind region and the interstellar region along the tail and polar directions of the heliosphere. By analyzing the radial flux curve along the direction of Voyager. 2, together with its trajectory information, the crossing time of the HP by Voyager. 2 is predicted to be in 2017.14. We simulate the CR radial flux for different energy values along the direction of Voyager. 1. We find that there is only a modest modulation region of about 10 au wide beyond the HP, so that Voyager. 1 observing the Local Interstellar Spectra is justified in numerical modeling. We analyze the heliospheric exit information of pseudo-particles in our stochastic numerical (time-backward) method, conjecturing that they represent the behavior of CR particles, and we find that pseudo-particles that have been traced from the nose region exit in the tail region. This implies that many CR particles diffuse directly from the heliospheric tail region to the nose region near the HP. In addition, when pseudo-particles were traced from the Local Interstellar Medium (LISM), it is found that their exit location (entrance for real particles) from the simulation domain is along the prescribed Interstellar Magnetic Field direction. This indicates that parallel diffusion dominates CR particle transport in the LISM.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5601
Appears in Collections:空间科学部_期刊论文

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