globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA024701
Scopus记录号: 2-s2.0-85046369376
论文题名:
Subsidence of Ionospheric Flows Triggered by Magnetotail Magnetic Reconnection During Transpolar Arc Brightening
作者: Nowada M.; Fear R.C.; Grocott A.; Shi Q.-Q.; Yang J.; Zong Q.-G.; Wei Y.; Fu S.-Y.; Pu Z.-Y.; Mailyan B.; Zhang H.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:5
起始页码: 3398
结束页码: 3420
语种: 英语
英文关键词: ionospheric plasma flows ; lobe and magnetotail magnetic reconnections ; transpolar arc and its formation ; TRINNIs
英文摘要: A transpolar arc (TPA), which extended from postmidnight to prenoon, was seen on 16 September 2001 in the Northern Hemisphere under northward interplanetary magnetic field (IMF)-Bz and weakly dawnward IMF-By conditions. Super Dual Auroral Radar Network detected significant westward plasma flows just equatorward of the poleward edge of the midnight sector auroral oval. These plasma flows were confined to closed field lines and are identified as the ionospheric plasma flow signature of tail reconnection during IMF northward nonsubstorm intervals (TRINNIs). These TRINNI flows persisted for 53 min from prior to the TPA appearance to the cessation of TPA growth. They are usually observed before (and during) intervals when TPAs are present, but in this case, subsided after the TPA was completely connected to the dayside. Additional slower flows across the open/closed polar cap boundary were seen at the TPA onset time in the same magnetic local time sector as the nightside end of the TPA. These ionospheric flows suggest that magnetotail reconnection significantly contributed to the TPA formation, as proposed by Milan et al. (, https://doi.org/10.1029/2004JA010835). We propose a possible scenario for an absence of the TRINNI flows during the TPA brightening by considering the relation between the extent of the magnetotail reconnection line mapped onto nightside auroral oval and the TPA width; TRINNI flows would subside when the extent of X-line is comparable to the TPA width. Therefore, our results suggest that the fate (absence or presence) of TRINNI flows on closed field lines during the TPA formation would be closely related with magnetotail reconnection extent. ©2018. American Geophysical Union.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113948
Appears in Collections:气候减缓与适应

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作者单位: Center for Space Weather Sciences, Institute of Space Sciences, School of Space Science and Physics, Shandong University at Weihai, Weihai, China; Department of Physics and Astronomy, University of Southampton, Southampton, United Kingdom; Space and Planetary Physics Group, Department of Physics, Lancaster University, Lancaster, United Kingdom; Institute of Space Physics and Applied Technology, School of Earth and Space Sciences, Peking University, Beijing, China; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States

Recommended Citation:
Nowada M.,Fear R.C.,Grocott A.,et al. Subsidence of Ionospheric Flows Triggered by Magnetotail Magnetic Reconnection During Transpolar Arc Brightening[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)
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