globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024155
Scopus ID: 2-s2.0-85042380890
On Multiple Hall-Like Electron Currents and Tripolar Guide Magnetic Field Perturbations During Kelvin-Helmholtz Waves
Author: Sturner A.P.; Eriksson S.; Nakamura T.; Gershman D.J.; Plaschke F.; Ergun R.E.; Wilder F.D.; Giles B.; Pollock C.; Paterson W.R.; Strangeway R.J.; Baumjohann W.; Burch J.L.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:2
pages begin: 1305
pages end: 1324
Language: 英语
Keyword: currents ; magnetic reconnection ; magnetopause
English Abstract: Two magnetopause current sheet crossings with tripolar guide magnetic field signatures were observed by multiple Magnetosphere Multiscale (MMS) spacecraft during Kelvin-Helmholtz wave activity. The two out-of-plane magnetic field depressions of the tripolar guide magnetic field are largely supported by the observed in-plane electron currents, which are reminiscent of two clockwise Hall current loop systems. A comparison with a three-dimensional kinetic simulation of Kelvin-Helmholtz waves and vortex-induced reconnection suggests that MMS likely encountered the two Hall magnetic field depressions on either side of a magnetic reconnection X-line. Moreover, MMS observed an out-of-plane current reversal and a corresponding in-plane magnetic field rotation at the center of one of the current sheets, suggesting the presence of two adjacent flux ropes. The region inside one of the ion-scale flux ropes was characterized by an observed decrease of the total magnetic field, a strong axial current, and significant enhancements of electron density and parallel electron temperature. The flux rope boundary was characterized by currents opposite this axial current, strong in-plane and converging electric fields, parallel electric fields, and weak electron-frame Joule dissipation. These return current region observations may reflect a need to support the axial current rather than representing local reconnection signatures in the absence of any exhausts. ©2018. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:9   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Denali Scientific, LLC, Healy, AK, United States; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Southwest Research Institute, San Antonio, TX, United States

Recommended Citation:
Sturner A.P.,Eriksson S.,Nakamura T.,et al. On Multiple Hall-Like Electron Currents and Tripolar Guide Magnetic Field Perturbations During Kelvin-Helmholtz Waves[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)
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