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Electron Acceleration in a Magnetotail Reconnection Outflow Region Using Magnetospheric MultiScale Data
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics. Swedish Institute of Space Physics, Uppsala, Sweden.ORCID iD: 0000-0003-1654-841x
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2020 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 47, no 1, article id e2019GL085080Article in journal (Refereed) Published
Abstract [en]

We study Magnetospheric MultiScale observations in the outflow region of magnetotail reconnection. We estimate the power density converted via the three fundamental electron acceleration mechanisms: Fermi, betatron, and parallel electric fields. The dominant mechanism, both on average and the peak values, is Fermi acceleration with a peak power density of about +200 pW/m3. The magnetic field curvature during the most intense Fermi acceleration is comparable to the electron gyroradius, consistent with efficient electron scattering. The peak power densities due to the betatron acceleration are a factor of 3 lower than that for the Fermi acceleration, the average betatron acceleration is close to zero and slightly negative. The contribution from parallel electric fields is significantly smaller than those from the Fermi and betatron acceleration. However, the observational uncertainties in the parallel electric field measurement prevent further conclusions. There is a strong variation in the power density on a characteristic ion time scale.

Place, publisher, year, edition, pages
Blackwell Publishing, 2020. Vol. 47, no 1, article id e2019GL085080
Keywords [en]
betatron acceleration, electron acceleration, Fermi acceleration, magnetic reconnection
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-267822DOI: 10.1029/2019GL085080ISI: 000513983400005Scopus ID: 2-s2.0-85078266696OAI: oai:DiVA.org:kth-267822DiVA, id: diva2:1397060
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QC 20200227

Available from: 2020-02-27 Created: 2020-02-27 Last updated: 2020-03-16Bibliographically approved

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Vaivads, Andris

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