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DOI	10.1073/pnas.2000614117
	Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail
	Zhang Q.-H.; Zhang Y.-L.; Wang C.; Lockwood M.; Yang H.-G.; Tang B.-B.; Xing Z.-Y.; Oksavik K.; Lyons L.R.; Ma Y.-Z.; Zong Q.-G.; Moen J.I.; Xia L.-D.
发表日期	2020
ISSN	0027-8424
起始页码	16193
结束页码	16198
卷号	117 期号:28
英文摘要	A distinct class of aurora, called transpolar auroral arc (TPA) (in some cases called “theta” aurora), appears in the extremely high-latitude ionosphere of the Earth when interplanetary magnetic field (IMF) is northward. The formation and evolution of TPA offers clues about processes transferring energy and momentum from the solar wind to the magnetosphere and ionosphere during a northward IMF. However, their formation mechanisms remain poorly understood and controversial. We report a mechanism identified from multiple-instrument observations of unusually bright, multiple TPAs and simulations from a high-resolution three-dimensional (3D) global MagnetoHydroDynamics (MHD) model. The observations and simulations show an excellent agreement and reveal that these multiple TPAs are generated by precipitating energetic magnetospheric electrons within field-aligned current (FAC) sheets. These FAC sheets are generated by multiple-flow shear sheets in both the magnetospheric boundary produced by Kelvin–Helmholtz instability between supersonic solar wind flow and magnetosphere plasma, and the plasma sheet generated by the interactions between the enhanced earthward plasma flows from the distant tail (less than -100 RE) and the enhanced tailward flows from the near tail (about -20 RE). The study offers insight into the complex solar wind-magnetosphere-ionosphere coupling processes under a northward IMF condition, and it challenges existing paradigms of the dynamics of the Earth’s magnetosphere. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Aurora; Magnetosphere; Polar ionosphere; Solar–terrestrial interaction; Transpolar auroral arcs
语种	英语
scopus关键词	article; blood flow; electron; human tissue; magnetic field; simulation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160257
作者单位	Zhang, Q.-H., Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, 264209, China; Zhang, Y.-L., Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723, United States; Wang, C., State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, 100190, China; Lockwood, M., Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom; Yang, H.-G., Ministry of Natural Resources Key Laboratory of Polar Science, Polar Research Institute of China, Shanghai, 200136, China; Tang, B.-B., State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, 100190, China; Xing, Z.-Y., Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, 264209, China; Oksavik,...
推荐引用方式 GB/T 7714	Zhang Q.-H.,Zhang Y.-L.,Wang C.,等. Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail[J],2020,117(28).
APA	Zhang Q.-H..,Zhang Y.-L..,Wang C..,Lockwood M..,Yang H.-G..,...&Xia L.-D..(2020).Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail.Proceedings of the National Academy of Sciences of the United States of America,117(28).
MLA	Zhang Q.-H.,et al."Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail".Proceedings of the National Academy of Sciences of the United States of America 117.28(2020).