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Reconstruction of the electron diffusion region observed by the Magnetospheric Multiscale spacecraft: First results
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 10, 4566-4574 p.Article in journal (Refereed) Published
Abstract [en]

We present first results of the reconstruction of the electron diffusion region (EDR) based on a two-dimensional, incompressible, and inertialess version of the electron magnetohydrodynamics equations. The method is applied to 30 ms resolution magnetic field, and electron moments data taken when the Magnetospheric Multiscale (MMS) spacecraft observed an EDR of near-antiparallel magnetopause reconnection on 16 October 2015. An X-type magnetic field configuration and quadrupolar Hall fields, consistent with the electron inflow and outflow, are successfully recovered. While MMS encountered a region of significant energy dissipation on the magnetospheric side of the sub-ion-scale current sheet, the reconstructions show that the MMS tetrahedron missed the X line by a distance of a few kilometers (~2 electron inertial lengths). The estimated reconnection electric field is 0.42–0.98 mV/m, equivalent to the dimensionless reconnection rate of 0.11–0.25. Signatures of three-dimensional structures and/or time-dependent processes are also identified.

Place, publisher, year, edition, pages
Blackwell Publishing Ltd , 2017. Vol. 44, no 10, 4566-4574 p.
Keyword [en]
electron diffusion region, electron magnetohydrodynamics, Hall physics, magnetic reconnection, magnetopause, Diffusion, Electric fields, Energy dissipation, Magnetic fields, Magnetism, Magnetohydrodynamics, Magnetosphere, Electron diffusion, Electron-magnetohydrodynamics equations, Magnetic field configurations, Magnetic reconnections, Magnetospheric multi scale, Three-dimensional structure, Electrons
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-216493DOI: 10.1002/2017GL073163ISI: 000404131900023Scopus ID: 2-s2.0-85019683369OAI: oai:DiVA.org:kth-216493DiVA: diva2:1162013
Note

Funding details: KAKENHI 15K05306, JSPS, Japan Society for the Promotion of Science; Funding details: NNX14AC38G, NASA, National Aeronautics and Space Administration; Funding text: MMS data are available from the MMS Science Data Center: https://lasp.colorado.edu/mms/sdc/public/. The MATLAB code for the reconstruction is available upon request to H.H. The work by H.H. was supported by JSPS Grant-in-Aid for Scientific Research KAKENHI 15K05306. Work at Dartmouth was supported by NASA grant NNX14AC38G.

QC 20171201

Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-01Bibliographically approved

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Lindqvist, Per-Arne

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