The magnetosphere under the radial interplanetary magnetic field: A numerical study

	The magnetosphere under the radial interplanetary magnetic field: A numerical study
	Tang, B. B.; Wang, C.; Li, W. Y.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2013-12-01
卷号	118 期号:12 页码:7674-7682
关键词	magnetosphere state radial IMF global MHD simulation
ISSN号	2169-9402
通讯作者	北京8701信箱
中文摘要	We investigate the magnetosphere under radial interplanetary magnetic fields (IMF) by using global magnetohydrodynamic simulations. The magnetosphere-ionosphere system falls into an unexpected state under this specific IMF orientation when the solar wind electric field vanishes. The most important features that characterize this state include (1) magnetic reconnections can still occur, which take place at the equatorward of the cusp in one hemisphere, the tailward of the cusp in the other hemisphere, and also in the plasma sheet; (2) significant north-south asymmetry exists in both magnetosphere and ionosphere; (3) the polar ionosphere mainly presents a weak two-cell convection pattern, with the polar cap potential valued at ∼30 kV; (4) the whole magnetosphere-ionosphere system stays in a very quiet state, and the AL index does not exceed −70 nT; and (5) the Kelvin-Helmholtz instability can still be excited at both flanks of the magnetosphere. These results imply the controlling role of the IMF direction between the solar wind and magnetosphere interactions and improve our understanding of the solar wind-magnetosphere-ionosphere system.
英文摘要	We investigate the magnetosphere under radial interplanetary magnetic fields (IMF) by using global magnetohydrodynamic simulations. The magnetosphere-ionosphere system falls into an unexpected state under this specific IMF orientation when the solar wind electric field vanishes. The most important features that characterize this state include (1) magnetic reconnections can still occur, which take place at the equatorward of the cusp in one hemisphere, the tailward of the cusp in the other hemisphere, and also in the plasma sheet; (2) significant north-south asymmetry exists in both magnetosphere and ionosphere; (3) the polar ionosphere mainly presents a weak two-cell convection pattern, with the polar cap potential valued at approximate to 30 kV; (4) the whole magnetosphere-ionosphere system stays in a very quiet state, and the AL index does not exceed -70 nT; and (5) the Kelvin-Helmholtz instability can still be excited at both flanks of the magnetosphere. These results imply the controlling role of the IMF direction between the solar wind and magnetosphere interactions and improve our understanding of the solar wind-magnetosphere-ionosphere system.
学科主题	空间物理
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SOLAR-WIND ; HILL MODEL ; MAGNETOPAUSE ; SIMULATIONS ; RECONNECTION ; GAS
收录类别	SCI
语种	英语
WOS记录号	WOS:000329508900022
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1528]
专题	国家空间科学中心_空间科学部
作者单位	Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Tang, B. B.,Wang, C.,Li, W. Y.. The magnetosphere under the radial interplanetary magnetic field: A numerical study[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2013,118(12):7674-7682.
APA	Tang, B. B.,Wang, C.,&Li, W. Y..(2013).The magnetosphere under the radial interplanetary magnetic field: A numerical study.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,118(12),7674-7682.
MLA	Tang, B. B.,et al."The magnetosphere under the radial interplanetary magnetic field: A numerical study".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.12(2013):7674-7682.