globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024686
Scopus ID: 2-s2.0-85042177325
Title:
Multiscale Currents Observed by MMS in the Flow Braking Region
Author: Nakamura R.; Varsani A.; Genestreti K.J.; Le Contel O.; Nakamura T.; Baumjohann W.; Nagai T.; Artemyev A.; Birn J.; Sergeev V.A.; Apatenkov S.; Ergun R.E.; Fuselier S.A.; Gershman D.J.; Giles B.J.; Khotyaintsev Y.V.; Lindqvist P.-A.; Magnes W.; Mauk B.; Petrukovich A.; Russell C.T.; Stawarz J.; Strangeway R.J.; Anderson B.; Burch J.L.; Bromund K.R.; Cohen I.; Fischer D.; Jaynes A.; Kepko L.; Le G.; Plaschke F.; Reeves G.; Singer H.J.; Slavin J.A.; Torbert R.B.; Turner D.L.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:2
pages begin: 1260
pages end: 1278
Language: 英语
Keyword: field-aligned current ; flow braking ; magnetic reconnection ; Magnetospheric Multiscale (MMS) ; plasma sheet boundary
English Abstract: We present characteristics of current layers in the off-equatorial near-Earth plasma sheet boundary observed with high time-resolution measurements from the Magnetospheric Multiscale mission during an intense substorm associated with multiple dipolarizations. The four Magnetospheric Multiscale spacecraft, separated by distances of about 50 km, were located in the southern hemisphere in the dusk portion of a substorm current wedge. They observed fast flow disturbances (up to about 500 km/s), most intense in the dawn-dusk direction. Field-aligned currents were observed initially within the expanding plasma sheet, where the flow and field disturbances showed the distinct pattern expected in the braking region of localized flows. Subsequently, intense thin field-aligned current layers were detected at the inner boundary of equatorward moving flux tubes together with Earthward streaming hot ions. Intense Hall current layers were found adjacent to the field-aligned currents. In particular, we found a Hall current structure in the vicinity of the Earthward streaming ion jet that consisted of mixed ion components, that is, hot unmagnetized ions, cold E × B drifting ions, and magnetized electrons. Our observations show that both the near-Earth plasma jet diversion and the thin Hall current layers formed around the reconnection jet boundary are the sites where diversion of the perpendicular currents take place that contribute to the observed field-aligned current pattern as predicted by simulations of reconnection jets. Hence, multiscale structure of flow braking is preserved in the field-aligned currents in the off-equatorial plasma sheet and is also translated to ionosphere to become a part of the substorm field-aligned current system. ©2018. The Authors.
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被引频次[WOS]:16   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/114495
Appears in Collections:气候减缓与适应

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Affiliation: Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Laboratoire de Physique des Plasmas, CNRS/Ecole Polytechnique/UPMC Univ Paris 06/University Paris-Sud/Observatoire de Paris, Paris, France; Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, Japan; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Space Science Institute, Boulder, CO, United States; Earth's Physics Department, St. Petersburg State University, St. Petersburg, Russian Federation; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States; Southwest Research Institute, San Antonio, TX, United States; NASA, Goddard Space Flight Center, Greenbelt, MD, United States; Swedish Institute of Space Physics, Uppsala, Sweden; Royal Institute of Technology, Stockholm, Sweden; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States; Space Research Institute (IKI), RAS, Moscow, Russian Federation; Department of Physics, Imperial College London, London, United Kingdom; LANL, CSES, Los Alamos, NM, United States; NOAA Space Weather Prediction Center, Boulder, CO, United States; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States; Space Sciences Department, Aerospace Corporation, Los Angeles, CA, United States

Recommended Citation:
Nakamura R.,Varsani A.,Genestreti K.J.,et al. Multiscale Currents Observed by MMS in the Flow Braking Region[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)
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