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MMS Observations of Whistler and Lower Hybrid Drift Waves Associated with Magnetic Reconnection in the Turbulent Magnetosheath
Austrian Acad Sci, Space Res Inst, Graz, Austria; RCAES, Geodet & Geophys Inst, Sopron, Hungary.ORCID iD: 0000-0001-7597-238X
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0002-9707-3147
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0002-1046-746x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-5550-3113
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2019 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402Article in journal (Refereed) Published
Abstract [en]

Magnetic reconnection (MR) and the associated concurrently occurring waves have been extensively studied at large-scale plasma boundaries, in quasi-symmetric and asymmetric configurations in the terrestrial magnetotail and at the magnetopause. Recent high-resolution observations by MMS (Magnetospheric Multiscale) spacecraft indicate that MR can occur also in the magnetosheath where the conditions are highly turbulent when the upstream shock geometry is quasi-parallel. The strong turbulent motions make the boundary conditions for evolving MR complicated. In this paper it is demonstrated that the wave observations in localized regions of MR can serve as an additional diagnostic tool reinforcing our capacity for identifying MR events in turbulent plasmas. It is shown that in a close resemblance with MR at large-scale boundaries, turbulent reconnection associated whistler waves occur at separatrix/outflow regions and at the outer boundary of the electron diffusion region, while lower hybrid drift waves are associated with density gradients during the crossing of the current sheet. The lower hybrid drift instability can make the density inhomogeneities rippled. The identification of MR associated waves in the magnetosheath represents also an important milestone for developing a better understanding of energy redistribution and dissipation in turbulent plasmas.

Place, publisher, year, edition, pages
2019.
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-397642DOI: 10.1029/2019JA027028ISI: 000494921200001OAI: oai:DiVA.org:uu-397642DiVA, id: diva2:1372293
Funder
Swedish Civil Contingencies Agency, 2016-2102
Note

Early View: Online Version of Record before inclusion in an issue

Available from: 2019-11-22 Created: 2019-11-22 Last updated: 2019-11-22Bibliographically approved

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Yordanova, EmiliyaGraham, Daniel B.Khotyaintsev, Yuri V.

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Voros, ZoltanYordanova, EmiliyaGraham, Daniel B.Khotyaintsev, Yuri V.Narita, Yasuhito
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Journal of Geophysical Research - Space Physics
Astronomy, Astrophysics and CosmologyFusion, Plasma and Space Physics

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