气候变化领域集成服务门户(CCPortal): Nonlinear Response of the Cross Polar Cap Potential to Solar Wind Density Under Northward Interplanetary Magnetic Field

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DOI	10.1029/2020GL087559
	Nonlinear Response of the Cross Polar Cap Potential to Solar Wind Density Under Northward Interplanetary Magnetic Field
	Yang Z.; Zhang B.; Lei J.; Dang T.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:8
英文摘要	It is commonly believed that the magnitude and orientation of interplanetary magnetic field (IMF) together with the solar wind (SW) velocity have the most important impact on the cross polar cap potential (φpc), so that little attention has been given to the effect of SW density, especially under northward IMF conditions. Previous studies have shown that φpc increases with SW density as a response to the changes in magnetosheath force balance, while our study shows that φpc has more complicated responses to the SW density depending on the magnitude of IMF rather than a simple linear response as reported previously. The φpc may be insensitive to SW density increasing at moderate IMF Bz (cf. 8 nT) and at intense Bz (20 nT) under large-density conditions. The different behavior of SW density in regulating φpc is mainly due to the competing effects originated from viscous interaction and magnetic reconnection. Further, the physical mechanisms are explored, including the driving sources of the viscous potential and affecting factors of reconnection potential. These results pave the way for better understanding of the SW density effects on solar wind-magnetosphere-ionosphere (SW-M-I) interactions. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ionosphere; Magnetic fields; Magnetosphere; Competing effects; Cross polar cap potential; Interplanetary magnetic fields; Magnetic reconnections; Non-linear response; Physical mechanism; Solar wind density; Viscous interaction; Solar wind; ionosphere; magnetic field; magnetosphere; solar wind
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170435
作者单位	CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, China; Department of Earth Sciences, The University of Hong Kong, Pokfulam, China
推荐引用方式 GB/T 7714	Yang Z.,Zhang B.,Lei J.,et al. Nonlinear Response of the Cross Polar Cap Potential to Solar Wind Density Under Northward Interplanetary Magnetic Field[J],2020,47(8).
APA	Yang Z.,Zhang B.,Lei J.,&Dang T..(2020).Nonlinear Response of the Cross Polar Cap Potential to Solar Wind Density Under Northward Interplanetary Magnetic Field.Geophysical Research Letters,47(8).
MLA	Yang Z.,et al."Nonlinear Response of the Cross Polar Cap Potential to Solar Wind Density Under Northward Interplanetary Magnetic Field".Geophysical Research Letters 47.8(2020).