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Magnetospheric Multiscale analysis of intense field-aligned Poynting flux near the Earth's plasma sheet boundary
Department of Physics, Imperial College London.
Department of Physics, Imperial College London.ORCID iD: 0000-0003-4733-8319
Space Research Institute, Austrian Academy of Sciences.ORCID iD: 0000-0003-1814-1568
Department of Astrophysical and Planetary Sciences, University of Colorado Boulder; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder.ORCID iD: 0000-0002-3096-8579
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 14, p. 7106-7113Article in journal (Refereed) Published
Abstract [en]

The Magnetospheric Multiscale mission is employed to examine intense Poynting flux directed along the background magnetic field toward Earth, which reaches amplitudes of nearly 2 mW/m(2). The event is located within the plasma sheet but likely near the boundary at a geocentric distance of 9 RE in association with bulk flow signatures. The fluctuations have wavelengths perpendicular to the magnetic field of 124-264 km (compared to an ion gyroradius of 280 km), consistent with highly kinetic Alfven waves. While the wave vector remains highly perpendicular to the magnetic field, there is substantial variation of the direction in the perpendicular plane. The field-aligned Poynting flux may be associated with kinetic Alfven waves released along the separatrix by magnetotail reconnection and/or the radiation of waves excited by bursty bulk flow braking and may provide a means through which energy released by magnetic reconnection is transferred to the auroral region.

Place, publisher, year, edition, pages
2017. Vol. 44, no 14, p. 7106-7113
Keywords [en]
High-Speed Flows; Alfven Waves; R-E; Layer; Tail; Acceleration; Spacecraft; Aurora; Polar; Power
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-334097DOI: 10.1002/2017GL073685ISI: 000407790500002OAI: oai:DiVA.org:uu-334097DiVA, id: diva2:1158936
Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-21Bibliographically approved

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Eastwood, J.P.Varsani, A.Ergun, R.E.Shay, M.A.Nakamura, R.Phan, T.D.Burch, J. L.Gershman, D. J.Giles, B. L.Goodrich, K. A.Khotyaintsev, Yuri V.Lindqvist, P. -ARussell, C. T.Strangeway, R. J.Torbert, R. B.
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Swedish Institute of Space Physics, Uppsala Division
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Geophysical Research Letters
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