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Effects in the Near-Magnetopause Magnetosheath Elicited by Large-Amplitube Alfvenic Fluctuations Terminating in a Field and Flow Discontinuity
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA.
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Univ New Hampshire, Space Sci Ctr, 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 11, p. 8983-9004Article in journal (Refereed) Published
Abstract [en]

In this paper we report on a sequence of large-amplitude Alfvenic fluctuations terminating in a field and flow discontinuity and their effects on electromagnetic fields and plasmas in the near-magnetopause magnetosheath. An arc-polarized structure in the magnetic field was observed by the Time History of Events and Macroscale Interactions during Substorms-C in the solar wind, indicative of nonlinear Alfven waves. It ends with a combined tangential discontinuity/vortex sheet, which is strongly inclined to the ecliptic plane and at which there is a sharp rise in the density and a drop in temperature. Several effects resulting from this structure were observed by the Magnetospheric Multiscale spacecraft in the magnetosheath close to the subsolar point (11:30 magnetic local time) and somewhat south of the geomagnetic equator (-33 degrees magnetic latitude): (i) kinetic Alfven waves; (ii) a peaking of the electric and magnetic field strengths where E . J becomes strong and negative (-1 nW/m(3)) just prior to an abrupt dropout of the fields; (iii) evolution in the pitch angle distribution of energetic (a few tens of kilo-electron-volts) ions (H+, Hen+, and On+) and electrons inside a high-density region, which we attribute to gyrosounding of the tangential discontinuity/vortex sheet structure passing by the spacecraft; (iv) field-aligned acceleration of ions and electrons that could be associated with localized magnetosheath reconnection inside the high-density region; and (v) variable and strong flow changes, which we argue to be unrelated to reconnection at partial magnetopause crossings and likely result from deflections of magnetosheath flow by a locally deformed, oscillating magnetopause.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2018. Vol. 123, no 11, p. 8983-9004
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Fusion, Plasma and Space Physics Geophysics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-372831DOI: 10.1029/2018JA025724ISI: 000453227400007OAI: oai:DiVA.org:uu-372831DiVA, id: diva2:1277208
Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved

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Alm, LoveKhotyaintsev, Yuri V.Lindqvist, P. A.Marklund, Göran T.

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Alm, LoveKhotyaintsev, Yuri V.Lindqvist, P. A.Marklund, Göran T.
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Swedish Institute of Space Physics, Uppsala Division
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Journal of Geophysical Research - Space Physics
Fusion, Plasma and Space PhysicsGeophysicsAstronomy, Astrophysics and Cosmology

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