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Properties of the Turbulence Associated with Electron-only Magnetic Reconnection in Earth's Magnetosheath
Imperial Coll London, Dept Phys, London, England..
Imperial Coll London, Dept Phys, London, England..
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
Imperial Coll London, Dept Phys, London, England..
Vise andre og tillknytning
2019 (engelsk)Inngår i: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 877, nr 2, artikkel-id L37Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Turbulent plasmas generate intense current structures, which have long been suggested as magnetic reconnection sites. Recent Magnetospheric Multiscale observations in Earth's magnetosheath revealed a novel form of reconnection where the dynamics only couple to electrons, without ion involvement. It was suggested that such dynamics were driven by magnetosheath turbulence. In this study, the fluctuations are examined to determine the properties of the turbulence and if a signature of reconnection is present in the turbulence statistics. The study reveals statistical properties consistent with plasma turbulence with a correlation length of similar to 10 ion inertial lengths. When reconnection is more prevalent, a steepening of the magnetic spectrum occurs at the length scale of the reconnecting current sheets. The statistics of intense currents suggest the prevalence of electron-scale current sheets favorable for electron reconnection. The results support the hypothesis that electron reconnection is driven by turbulence and highlight diagnostics that may provide insight into reconnection in other turbulent plasmas.

sted, utgiver, år, opplag, sider
Institute of Physics (IOP), 2019. Vol. 877, nr 2, artikkel-id L37
Emneord [en]
magnetic reconnection, plasmas, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-254089DOI: 10.3847/2041-8213/ab21c8ISI: 000470754000003Scopus ID: 2-s2.0-84991243401OAI: oai:DiVA.org:kth-254089DiVA, id: diva2:1330233
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QC 20190625

Tilgjengelig fra: 2019-06-25 Laget: 2019-06-25 Sist oppdatert: 2019-06-25bibliografisk kontrollert

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