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题名: Effects of Anomalous Cosmic Rays on the Structure of the Outer Heliosphere
作者: Guo, Xiaocheng; Florinski, Vladimir; Wang, Chi
作者部门: 空间科学部
通讯作者: Guo, XC (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China. ; Guo, XC (reprint author), Univ Chinese Acad Sci, Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China.
关键词: cosmic rays ; diffusion ; magnetohydrodynamics (MHD) ; methods: numerical ; plasmas Sun: heliosphere
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2018
卷号: 859, 期号:2, 页码:157
收录类别: SCI
项目资助者: NNSFC [41674146, 41731070, 41574159] ; Specialized Research Fund for State Key Laboratories of China ; NSSC research fund for key development directions ; Strategic Pioneer Program on Space Science of CAS [XDA15052500] ; NASA [NNX13AF99G, QYZDJ-SSW-JSC028, NNX17AB85G]
英文摘要: Based on Voyager 1 observations, some anomalous cosmic rays (ACRs) may have crossed the heliopause and escaped into the interstellar medium, providing a mechanism of energy transfer between the inner and outer heliosheaths that is not included in conventional magnetohydrodynamics (MHD) models. In this paper, we study the effect of energetic particles' escape through the heliopause on the size and shape of the heliosphere using a simple model that includes diffusive transport of cosmic rays. We show that the presence of ACRs significantly changes the heliosphere structure, including the location of the heliopause and termination shock. It was found that the heliopause would contract for certain values of the ACR diffusion coefficients when the diffusive particles' pressure is comparable to the pressure of the plasma background. The difference in Voyager 1 and 2 observations of energetic particles during their respective termination shock crossings is interpreted here as due to the differences in diffusion environments during the different phases of the solar cycle. The shorter period of enhanced ACR intensities upstream of the shock measured by Voyager 2 may have been caused by weaker radial diffusive transport compared with the time of Voyager 1 crossing. We conclude that ACR diffusive effects could be prominent and should be included in MHD models of the heliosphere.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6324
Appears in Collections:空间科学部_期刊论文

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