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Pressure balance across the magnetopause: Global MHD results
Lu, J. Y.1; Wang, M.1; Kabin, K.2; Zhao, J. S.3; Liu, Z. -Q.4; Zhao, M. X.5; Li, G.1
AbstractThe 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.
KeywordPressure Balance Energy Conversion Magnetopause Magnetohydrodynamic
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000350519200008
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
GB/T 7714
Lu, J. Y.,Wang, M.,Kabin, K.,et al. Pressure balance across the magnetopause: Global MHD results[J]. PLANETARY AND SPACE SCIENCE,2015,106:108-115.
APA Lu, J. Y..,Wang, M..,Kabin, K..,Zhao, J. S..,Liu, Z. -Q..,...&Li, G..(2015).Pressure balance across the magnetopause: Global MHD results.PLANETARY AND SPACE SCIENCE,106,108-115.
MLA Lu, J. Y.,et al."Pressure balance across the magnetopause: Global MHD results".PLANETARY AND SPACE SCIENCE 106(2015):108-115.
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