globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2000614117
论文题名:
Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:28
起始页码: 16193
结束页码: 16198
语种: 英语
英文关键词: Aurora ; Magnetosphere ; Polar ionosphere ; Solar–terrestrial interaction ; Transpolar auroral arcs
Scopus关键词: article ; blood flow ; electron ; human tissue ; magnetic field ; simulation
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163431
Appears in Collections:气候变化与战略

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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, K., Department of Physics and Technology, Birkeland Centre for Space Science, University of Bergen, Bergen, N-5020, Norway, Arctic Geophysics Department, University Centre in Svalbard, Longyearbyen, N-9171, Norway; Lyons, L.R., Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, United States; Ma, Y.-Z., Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, 264209, China; Zong, Q.-G., School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Moen, J.I., Arctic Geophysics Department, University Centre in Svalbard, Longyearbyen, N-9171, Norway, Department of Physics, University of Oslo, Blindern, Oslo, 0371, Norway; Xia, L.-D., Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, 264209, China

Recommended Citation:
Zhang Q.-H.,Zhang Y.-L.,Wang C.,et al. Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(28)
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