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Guide Field Reconnection: Exhaust Structure and Heating
Imperial Coll London, Blackett Lab, London, England..
Imperial Coll London, Blackett Lab, London, England..
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
Imperial Coll London, Blackett Lab, London, England.;Univ Colorado, Dept Astrophys & Planetary Sci, LASP, Boulder, CO 80309 USA..
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2018 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 10, p. 4569-4577Article in journal (Refereed) Published
Abstract [en]

Magnetospheric Multiscale observations are used to probe the structure and temperature profile of a guide field reconnection exhaust similar to 100 ion inertial lengths downstream from the X-line in the Earth's magnetosheath. Asymmetric Hall electric and magnetic field signatures were detected, together with a density cavity confined near 1 edge of the exhaust and containing electron flow toward the X-line. Electron holes were also detected both on the cavity edge and at the Hall magnetic field reversal. Predominantly parallel ion and electron heating was observed in the main exhaust, but within the cavity, electron cooling and enhanced parallel ion heating were found. This is explained in terms of the parallel electric field, which inhibits electron mixing within the cavity on newly reconnected field lines but accelerates ions. Consequently, guide field reconnection causes inhomogeneous changes in ion and electron temperature across the exhaust.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2018. Vol. 45, no 10, p. 4569-4577
Keywords [en]
Magnetic Reconnection, Magnetosheath, Plasma heating, Electron hole, Magnetospheric Multiscale
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-231738DOI: 10.1029/2018GL077670ISI: 000435262000005Scopus ID: 2-s2.0-85047549769OAI: oai:DiVA.org:kth-231738DiVA, id: diva2:1230291
Note

QC 20180703

Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2018-07-03Bibliographically approved

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Lindqvist, Per-Arne

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