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Electron jet of asymmetric reconnection
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 11, 5571-5580 p.Article in journal (Refereed) PublishedText
Abstract [en]

We present Magnetospheric Multiscale observations of an electron-scale current sheet and electron outflow jet for asymmetric reconnection with guide field at the subsolar magnetopause. The electron jet observed within the reconnection region has an electron Mach number of 0.35 and is associated with electron agyrotropy. The jet is unstable to an electrostatic instability which generates intense waves with E-vertical bar amplitudes reaching up to 300mVm(-1) and potentials up to 20% of the electron thermal energy. We see evidence of interaction between the waves and the electron beam, leading to quick thermalization of the beam and stabilization of the instability. The wave phase speed is comparable to the ion thermal speed, suggesting that the instability is of Buneman type, and therefore introduces electron-ion drag and leads to braking of the electron flow. Our observations demonstrate that electrostatic turbulence plays an important role in the electron-scale physics of asymmetric reconnection.

Place, publisher, year, edition, pages
2016. Vol. 43, no 11, 5571-5580 p.
Keyword [en]
magnetic reconnection, diffusion region, electron dynamics, lower hybrid waves, Buneman instability
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-301043DOI: 10.1002/2016GL069064ISI: 000379851800005OAI: oai:DiVA.org:uu-301043DiVA: diva2:953555
Funder
Swedish National Space Board, 139/12, 175/15
Available from: 2016-08-18 Created: 2016-08-17 Last updated: 2016-08-18Bibliographically approved

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Khotyaintsev, Yuri V.Graham, D. B.Norgren, CeciliaEriksson, ElinLi, WenyaJohlander, AndreasVaivads, AndrisAndre, Mats
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Swedish Institute of Space Physics, Uppsala DivisionDepartment of Physics and Astronomy
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Geophysical Research Letters
Astronomy, Astrophysics and Cosmology

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