GALACTIC COSMIC-RAY MODULATION IN A REALISTIC GLOBAL MAGNETOHYDRODYNAMIC HELIOSPHERE
文献类型：期刊论文
| 作者 | Luo, Xi; Zhang, Ming; Rassoul, Hamid K.; Pogorelov, Nikolai V.; Heerikhuisen, Jacob |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2013 |
| 卷号 | 764期号:1页码:85 |
| 关键词 | cosmic rays magnetohydrodynamics (MHD) methods: numerical shock waves solar wind Sun: heliosphere |
| ISSN号 | 0004-637X |
| 通讯作者 | Luo, X (reprint author), Chinese Acad Sci, SIGMA Weather Grp, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China. |
| 英文摘要 | To understand the behavior of cosmic-ray modulation seen by the two Voyager spacecraft in the region near the termination shock (TS) and in the heliosheath at a distance of >100 AU, a realistic magnetohydrodynamic global heliosphere model is incorporated into our cosmic-ray transport code, so that the detailed effects of the heliospheric boundaries and their plasma/magnetic geometry can be revealed. A number of simulations of cosmic-ray modulation performed with this code result in the following conclusions. (1) Diffusive shock acceleration by the TS can significantly affect the level of cosmic-ray flux and, in particular, its radial gradient profile in the region near the TS and in the inner heliosheath. (2) The radial profile of cosmic-ray flux strongly depends on longitude. There is a slight north-south asymmetry due to an asymmetric TS, but the larger difference in the radial profiles comes from longitudinal variation. Voyager 1 and 2 are separated by similar to 40 degrees in longitude. Simulations in these two directions show a large difference in the radial profile of cosmic-ray flux. Thus, it is not appropriate to determine the cosmic-ray radial gradient by directly using the two-point Voyager measurements. Various other simulations are also performed to show how sensitively the modulation level depends on latitude, cosmic-ray energy, and interstellar spectrum. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/5038]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Luo, Xi,Zhang, Ming,Rassoul, Hamid K.,et al. GALACTIC COSMIC-RAY MODULATION IN A REALISTIC GLOBAL MAGNETOHYDRODYNAMIC HELIOSPHERE[J]. ASTROPHYSICAL JOURNAL,2013,764(1):85. |
| APA | Luo, Xi,Zhang, Ming,Rassoul, Hamid K.,Pogorelov, Nikolai V.,&Heerikhuisen, Jacob.(2013).GALACTIC COSMIC-RAY MODULATION IN A REALISTIC GLOBAL MAGNETOHYDRODYNAMIC HELIOSPHERE.ASTROPHYSICAL JOURNAL,764(1),85. |
| MLA | Luo, Xi,et al."GALACTIC COSMIC-RAY MODULATION IN A REALISTIC GLOBAL MAGNETOHYDRODYNAMIC HELIOSPHERE".ASTROPHYSICAL JOURNAL 764.1(2013):85. |
入库方式： OAI收割
来源：国家空间科学中心
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