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题名: Modulation of Galactic Cosmic Rays in the Inner Heliosphere, Comparing with PAMELA Measurements
作者: Qin, G.; Shen, Z. -N.
作者部门: 空间科学部
通讯作者: Qin, G (reprint author), Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China. ; Qin, G (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China. ; Qin, G (reprint author), Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China.
关键词: cosmic rays ; Sun: activity ; Sun: heliosphere ; turbulence
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 846, 期号:1
收录类别: SCI
项目资助者: Specialized Research Fund for State Key Laboratories of China ; [NNSFC 41374177] ; [NNSFC 41574172] ; [NNSFC 41125016]
英文摘要: We develop a numerical model to study the time-dependent modulation of galactic cosmic rays in the inner heliosphere. In the model, a time-delayed modified Parker heliospheric magnetic field (HMF) and a new diffusion coefficient model, NLGCE-F, from Qin & Zhang, are adopted. In addition, the latitudinal dependence of magnetic turbulence magnitude is assumed to be similar to(1 + sin(2) theta)/2 from the observations of Ulysses, and the radial dependence is assumed to be similar to r(S), where we choose an expression of S as a function of the heliospheric current sheet tilt angle. We show that the analytical expression used to describe the spatial variation of HMF turbulence magnitude agrees well with the Ulysses, Voyager 1, and Voyager 2 observations. By numerically calculating the modulation code, we get the proton energy spectra as a function of time during the recent solar minimum, it is shown that the modulation results are consistent with the Payload for Antimatter-Matter Exploration and Light-nuclei Astrophysics measurements.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6037
Appears in Collections:空间科学部_期刊论文

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