Drift waves, intense parallel electric fields, and turbulence associated with asymmetric magnetic reconnection at the magnetopause

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Title: Drift waves, intense parallel electric fields, and turbulence associated with asymmetric magnetic reconnection at the magnetopause
Author(s): Ergun, RE
Chen, L-J
Wilder, FD
Ahmadi, N
Eriksson, S
Usanova, ME
Goodrich, KA
Holmes, JC
Sturner, AP
Malaspina, DM
Newman, DL
Torbert, RB
Argall, MR
Lindqvist, P-A
Burch, JL
Webster, JM
Drake, JF
Price, L
Cassak, PA
Swisdak, M
Shay, MA
Graham, DB
Strangeway, RJ
Russell, CT
Giles, BL
Dorelli, JC
Gershman, D
Avanov, L
Hesse, M
Lavraud, B
Le Contel, O
Retino, A
Phan, TD
Goldman, MV
Stawarz, JE
Schwartz, SJ
Eastwood, JP
Hwang, K-J
Nakamura, R
Wang, S
Item Type: Journal Article
Abstract: Observations of magnetic reconnection at Earth's magnetopause often display asymmetric structures that are accompanied by strong magnetic field (B) fluctuations and large-amplitude parallel electric fields (E||). The B turbulence is most intense at frequencies above the ion cyclotron frequency and below the lower hybrid frequency. The B fluctuations are consistent with a thin, oscillating current sheet that is corrugated along the electron flow direction (along the X line), which is a type of electromagnetic drift wave. Near the X line, electron flow is primarily due to a Hall electric field, which diverts ion flow in asymmetric reconnection and accompanies the instability. Importantly, the drift waves appear to drive strong parallel currents which, in turn, generate large-amplitude (~100 mV/m) E|| in the form of nonlinear waves and structures. These observations suggest that turbulence may be common in asymmetric reconnection, penetrate into the electron diffusion region, and possibly influence the magnetic reconnection process.
Publication Date: 9-Apr-2017
Date of Acceptance: 21-Mar-2017
URI: http://hdl.handle.net/10044/1/48361
DOI: https://dx.doi.org/10.1002/2016GL072493
ISSN: 0094-8276
Publisher: American Geophysical Union
Start Page: 2978
End Page: 2986
Journal / Book Title: GEOPHYSICAL RESEARCH LETTERS
Volume: 44
Issue: 7
Copyright Statement: © 2017 American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. Ergun, R. E., et al. (2017), Drift waves, intense parallel electric fields, and turbulence associated with asymmetric magnetic reconnection at the magnetopause, Geophys. Res. Lett., 44, 2978–2986, doi:10.1002/2016GL072493. To view the published open abstract, go to: https://dx.doi.org/10.1002/2016GL072493
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/N000692/1
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
asymmetric magnetic reconnection
drift waves
parallel electric fields
turbulence
DIFFUSION REGION
MAGNETOSPHERIC MULTISCALE
MMS OBSERVATIONS
X-LINE
INSTABILITY
DISSIPATION
Meteorology & Atmospheric Sciences
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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