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Wave Phenomena and Beam-Plasma Interactions at the Magnetopause Reconnection Region
Southwest Res Inst, San Antonio, TX 78238 USA..
Rice Univ, Dept Phys & Astron, Houston, TX USA..
Austrian Acad Sci, Space Res Inst, Graz, Austria..
Southwest Res Inst, San Antonio, TX 78238 USA.;Univ New Hampshire, Dept Phys, Durham, NH 03824 USA..
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2018 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 123, no 2, p. 1118-1133Article in journal (Refereed) Published
Abstract [en]

This paper reports on Magnetospheric Multiscale observations of whistler mode chorus and higher-frequency electrostatic waves near and within a reconnection diffusion region on 23 November 2016. The diffusion region is bounded by crescent-shaped electron distributions and associated dissipation just upstream of the X-line and by magnetic field-aligned currents and electric fields leading to dissipation near the electron stagnation point. Measurements were made southward of the X-line as determined by southward directed ion and electron jets. We show that electrostatic wave generation is due to magnetosheath electron beams formed by the electron jets as they interact with a cold background plasma and more energetic population of magnetospheric electrons. On the magnetosphere side of the X-line the electron beams are accompanied by a strong perpendicular electron temperature anisotropy, which is shown to be the source of an observed rising-tone whistler mode chorus event. We show that the apex of the chorus event and the onset of electrostatic waves coincide with the opening of magnetic field lines at the electron stagnation point.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2018. Vol. 123, no 2, p. 1118-1133
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Physical Sciences
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URN: urn:nbn:se:kth:diva-225749DOI: 10.1002/2017JA024789ISI: 000427568000005Scopus ID: 2-s2.0-85044080104OAI: oai:DiVA.org:kth-225749DiVA, id: diva2:1196469
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QC 20180410

Available from: 2018-04-10 Created: 2018-04-10 Last updated: 2018-04-10Bibliographically approved

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Lindqvist, Per-Arne

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