Structure of the current sheet in the 11 July 2017 Electron Diffusion Region Event

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Title: Structure of the current sheet in the 11 July 2017 Electron Diffusion Region Event
Authors: Nakamura, R
Genestreti, KJ
Nakamura, T
Baumjohann, W
Varsani, A
Nagai, T
Bessho, N
Burch, JL
Denton, RE
Eastwood, JP
Ergun, RE
Gershman, DJ
Giles, BL
Hasegawa, H
Hesse, M
Lindqvist, P-A
Russell, CT
Stawarz, JE
Strangeway, RJ
Torbert, RB
Item Type: Journal Article
Abstract: The structure of the current sheet along the Magnetospheric Multiscale (MMS) orbit is examined during the 11 July 2017 Electron Diffusion Region (EDR) event. The location of MMS relative to the X‐line is deduced and used to obtain the spatial changes in the electron parameters. The electron velocity gradient values are used to estimate the reconnection electric field sustained by nongyrotropic pressure. It is shown that the observations are consistent with theoretical expectations for an inner EDR in 2‐D reconnection. That is, the magnetic field gradient scale, where the electric field due to electron nongyrotropic pressure dominates, is comparable to the gyroscale of the thermal electrons at the edge of the inner EDR. Our approximation of the MMS observations using a steady state, quasi‐2‐D, tailward retreating X‐line was valid only for about 1.4 s. This suggests that the inner EDR is localized; that is, electron outflow jet braking takes place within an ion inertia scale from the X‐line. The existence of multiple events or current sheet processes outside the EDR may play an important role in the geometry of reconnection in the near‐Earth magnetotail.
Issue Date: 1-Feb-2019
Date of Acceptance: 19-Dec-2018
ISSN: 2169-9380
Publisher: American Geophysical Union (AGU)
Start Page: 1173
End Page: 1186
Journal / Book Title: Journal of Geophysical Research: Space Physics
Volume: 124
Issue: 2
Copyright Statement: © 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/N000692/1
Publication Status: Published
Online Publication Date: 2019-02-27
Appears in Collections:Space and Atmospheric Physics
Faculty of Natural Sciences

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