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Electron Diffusion Regions in Magnetotail Reconnection Under Varying Guide Fields
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2019 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, no 12, p. 6230-6238Article in journal (Refereed) Published
Abstract [en]

Kinetic structures of electron diffusion regions (EDRs) under finite guide fields in magnetotail reconnection are reported. The EDRs with guide fields 0.14–0.5 (in unit of the reconnecting component) are detected by the Magnetospheric Multiscale spacecraft. The key new features include the following: (1) cold inflowing electrons accelerated along the guide field and demagnetized at the magnetic field minimum while remaining a coherent population with a low perpendicular temperature, (2) wave fluctuations generating strong perpendicular electron flows followed by alternating parallel flows inside the reconnecting current sheet under an intermediate guide field, and (3) gyrophase bunched electrons with high parallel speeds leaving the X-line region. The normalized reconnection rates for the three EDRs range from 0.05 to 0.3. The measurements reveal that finite guide fields introduce new mechanisms to break the electron frozen-in condition.

Place, publisher, year, edition, pages
Blackwell Publishing, 2019. Vol. 46, no 12, p. 6230-6238
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:kth:diva-262616DOI: 10.1029/2019GL082393ISI: 000477616300009Scopus ID: 2-s2.0-85068146069OAI: oai:DiVA.org:kth-262616DiVA, id: diva2:1365411
Note

QC 20191024

Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2022-06-26Bibliographically approved

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Lindqvist, Per-Arne

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