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Drift waves, intense parallel electric fields, and turbulence associated with asymmetric magnetic reconnection at the magnetopause
Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA..
Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA..
Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA..
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 7, 2978-2986 p.Article in journal (Refereed) Published
Abstract [en]

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 (similar to 100mV/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.

Place, publisher, year, edition, pages
2017. Vol. 44, no 7, 2978-2986 p.
Keyword [en]
asymmetric magnetic reconnection, drift waves, parallel electric fields, turbulence
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-322812DOI: 10.1002/2016GL072493ISI: 000400186500002OAI: oai:DiVA.org:uu-322812DiVA: diva2:1103646
Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

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Swedish Institute of Space Physics, Uppsala Division
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