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dc.contributor.author
Farrugia, C. J.
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Gratton, Fausto Tulio Livio
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Lund, E.J.
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Sandholt, P.E.
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Cowley, S.W.H.
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Torbert, R.B.
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Gnavi, Graciela Delia
dc.contributor.author
Mann, I.R.
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Bilbao, Luis Ernesto
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Mouikis, C.
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Kistler, L.
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Smith, C.W.
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Singer, H.J.
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Watermann, J.F.
dc.date.available
2018-10-02T14:54:54Z
dc.date.issued
2008-12
dc.identifier.citation
Farrugia, C. J.; Gratton, Fausto Tulio Livio; Lund, E.J.; Sandholt, P.E.; Cowley, S.W.H.; et al.; Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations; Blackwell Publishing Ltd; Journal of Geophysical Research: Space Physics; 113; 3; 12-2008; 1-15
dc.identifier.issn
2169-9402
dc.identifier.uri
http://hdl.handle.net/11336/61488
dc.description.abstract
We discuss the motion and structure of the magnetopause/boundary layer observed by Cluster in response to a joint tangential discontinuity/vortex sheet (TD/VS) observed by the Advanced Composition Explorer spacecraft on 7 December 2000. The observations are then supplemented by theory. Sharp polarity reversals in the east-west components of the field and flow By and V y occurred at the discontinuity. These rotations were followed by a period of strongly northward interplanetary magnetic field (IMF). These two factors elicited a two-stage response at the magnetopause, as observed by Cluster situated in the boundary layer at the duskside terminator. First, the magnetopause suffered a large deformation from its equilibrium position, with large-amplitude oscillations of ∼3-min period being set up. These are argued to be mainly the result of tangential stresses associated with ΔV ythe contribution of dynamic pressure changes being small in comparison. This strengthens recent evidence of the importance to magnetospheric dynamics of changes in azimuthal solar wind flow. The TD/VS impact caused a global response seen by ground magnetometers in a magnetic local time range spanning at least 12 h. The response monitored on ground magnetometers is similar to that brought about by magnetopause motions driven by dynamic pressure changes. Second, Cluster recorded higher-frequency waves (∼79 s). Two clear phases could be distinguished from the spectral power density, which decreased by a factor of ∼3 in the second phase. Applying compressible linearized MHD theory, we show that these waves are generated by the Kelvin-Helmholtz (KH) instability. Varying the local magnetic shear at the Cluster locale, as suggested by the temporal profile of the IMF clock angle, we find that locally stability was reinstated, so that the reduced power in the second phase is argued to be due residual KH activity arriving from locations farther to the dayside. Copyright 2008 by the American Geophysical Union.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Blackwell Publishing Ltd
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Magnetopause
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Tangential Discontinuity
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Vortex Sheet
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Northward Imf
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-10-01T16:03:38Z
dc.journal.volume
113
dc.journal.number
3
dc.journal.pagination
1-15
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Farrugia, C. J.. University Of New Hampshire Durham;
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Fil: Gratton, Fausto Tulio Livio. Universidad de Buenos Aires; Argentina. Pontificia Universidad Católica Argentina "Santa María de los Buenos Aires"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física del Plasma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física del Plasma; Argentina
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Fil: Lund, E.J.. University Of New Hampshire Durham; Reino Unido
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Fil: Sandholt, P.E.. University of Oslo; Noruega
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Fil: Cowley, S.W.H.. University of Leicester; Reino Unido
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Fil: Torbert, R.B.. University Of New Hampshire Durham; Reino Unido
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Fil: Gnavi, Graciela Delia. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física del Plasma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física del Plasma; Argentina
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Fil: Mann, I.R.. University of Alberta; Canadá
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Fil: Bilbao, Luis Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física del Plasma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física del Plasma; Argentina
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Fil: Mouikis, C.. University Of New Hampshire Durham; Reino Unido
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Fil: Kistler, L.. University Of New Hampshire Durham; Reino Unido
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Fil: Smith, C.W.. University Of New Hampshire Durham;
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Fil: Singer, H.J.. National Oceanic And Atmospheric Administration; Estados Unidos
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Fil: Watermann, J.F.. Danmarks Meteorologiske Institut; Dinamarca
dc.journal.title
Journal of Geophysical Research: Space Physics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1029/2007JA012800
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