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MMS observations of electron-scale filamentary currents in the reconnection exhaust and near the X line
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London, England..
West Virginia Univ, Dept Phys & Astron, Morgantown, WV USA..
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
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2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 12, 6060-6069 p.Article in journal (Refereed) Published
Abstract [en]

We report Magnetospheric Multiscale observations of macroscopic and electron-scale current layers in asymmetric reconnection. By intercomparing plasma, magnetic, and electric field data at multiple crossings of a reconnecting magnetopause on 22 October 2015, when the average interspacecraft separation was similar to 10 km, we demonstrate that the ion and electron moments are sufficiently accurate to provide reliable current density measurements at 30ms cadence. These measurements, which resolve current layers narrower than the interspacecraft separation, reveal electron-scale filamentary Hall currents and electron vorticity within the reconnection exhaust far downstream of the X line and even in the magnetosheath. Slightly downstream of the X line, intense (up to 3 mu A/m(2)) electron currents, a super-Alfvenic outflowing electron jet, and nongyrotropic crescent shape electron distributions were observed deep inside the ion-scale magnetopause current sheet and embedded in the ion diffusion region. These characteristics are similar to those attributed to the electron dissipation/diffusion region around the X line.

Place, publisher, year, edition, pages
2016. Vol. 43, no 12, 6060-6069 p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-307971DOI: 10.1002/2016GL069212ISI: 000380910100019OAI: oai:DiVA.org:uu-307971DiVA: diva2:1049122
Available from: 2016-11-23 Created: 2016-11-23 Last updated: 2016-11-23Bibliographically approved

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Khotyaintsev, Yuri
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Swedish Institute of Space Physics, Uppsala Division
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