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题名: Pressure balance across the magnetopause: Global MHD results
作者: Lu, J. Y.1; Wang Min(王敏)1; Kabin, K.2; Zhao, J. S.3; Liu, Z. -Q.4; Zhao, M. X.5; Li, G.1
刊名: PLANETARY AND SPACE SCIENCE
出版日期: 2015-02-01
卷号: 106, 页码:108-115
关键词: Pressure balance ; Energy conversion ; Magnetopause ; Magnetohydrodynamic
学科分类: 天文和天体物理
DOI: 10.1016/j.pss.2014.12.003
文章类型: Article
英文摘要: The equilibrium magnetopause location on the dayside is determined by the balance of pressure forces. In this paper we use a physics-based global magnetohydrodynamic (MHD) to examine contributions of different terms to this balance. We calculate the total pressure, as well as thermal and magnetic pressures just inside and just outside the magnetopause. Our results show that (1) the total pressure just outside the magnetopause is enhanced with the increasing of B-z in both northward and southward interplanetary magnetic field (IMF). For southward IMF the thermal pressure is dominant in the total pressure while the magnetic pressure is dominant for northward IMF when B-z is not small (B-z > 5 nT). For southward IMF larger solar wind dynamic pressure further enhances thermal pressure near the magnetopause while for northward IMF the dynamic pressure is more effectively converted to the magnetic pressure; (2) the thermal pressure just outside the magnetopause is significantly enhanced with the increasing southward IMF as compared to the northward IMF case. However, this enhanced thermal pressure is not the only reason for the well-known earthward displacement of the magnetopause under southward IMF conditions. The dayside magnetic reconnection for southward IMF dramatically decreases magnetic pressure just inside the magnetopause. The combination of these two factors explains the Earthward motion of the magnetopause for southward IMF. (C) 2014 Elsevier Ltd. All rights reserved.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: EARTHS MAGNETOPAUSE ; SOLAR-WIND ; DAYSIDE MAGNETOSPHERE ; MAGNETIC-FIELD ; BOW SHOCK ; SHAPE ; SIZE ; RECONNECTION ; SIMULATION ; MOTION
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000350519200008
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14839
Appears in Collections:太阳和太阳系等离子体研究团组_期刊论文

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作者单位: 1.Nanjing Univ Informat Sci & Technol, Sch Math & Stat, Inst Space Weather, Nanjing 210044, Jiangsu, Peoples R China
2.Royal Mil Coll Canada, Dept Phys, Kingston, ON, Canada
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100080, Peoples R China
5.China Meteorol Adm, Natl Ctr Space Weather, Beijing 100081, Peoples R China
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