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Electron Jet of Asymmetric ReconnectionWe 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(sub parallel lines) amplitudes reaching up to 300 mV/m 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.
Document ID
20170003568
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Khotyaintsev, Yu. V.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Graham, D. B.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Norgren, C.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Eriksson, E.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Li, W.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Johlander, A.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Vaivads, A.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Andre, M.
(Swedish Inst. of Space Physics Uppsala, Sweden)
Pritchett, P. L.
(California Univ. Berkeley, CA, United States)
Retino, A.
(Centre National de la Recherche Scientifique Palaiseau, France)
Paterson, W. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gershman, D. J.
(Maryland Univ. College Park, MD, United States)
Dorelli, J. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Avanov, L. A.
(Maryland Univ. College Park, MD, United States)
Giles, B. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pollock, C. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
April 17, 2017
Publication Date
June 6, 2016
Publication Information
Publication: Geophysical Research Letters
Volume: 43
Issue: 11
ISSN: 0094-8276
Subject Category
Geophysics
Report/Patent Number
GSFC-E-DAA-TN41316
Funding Number(s)
CONTRACT_GRANT: SNSB 139/2
CONTRACT_GRANT: SNSB 175/15
Distribution Limits
Public
Copyright
Other
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