Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations

Autores
Farrugia, C. J.; Gratton, Fausto Tulio Livio; Lund, E.J.; Sandholt, P.E.; Cowley, S.W.H.; Torbert, R.B.; Gnavi, Graciela Delia; Mann, I.R.; Bilbao, Luis Ernesto; Mouikis, C.; Kistler, L.; Smith, C.W.; Singer, H.J.; Watermann, J.F.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Farrugia, C. J.. University Of New Hampshire Durham;
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
Fil: Lund, E.J.. University Of New Hampshire Durham; Reino Unido
Fil: Sandholt, P.E.. University of Oslo; Noruega
Fil: Cowley, S.W.H.. University of Leicester; Reino Unido
Fil: Torbert, R.B.. University Of New Hampshire Durham; Reino Unido
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
Fil: Mann, I.R.. University of Alberta; Canadá
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
Fil: Mouikis, C.. University Of New Hampshire Durham; Reino Unido
Fil: Kistler, L.. University Of New Hampshire Durham; Reino Unido
Fil: Smith, C.W.. University Of New Hampshire Durham;
Fil: Singer, H.J.. National Oceanic And Atmospheric Administration; Estados Unidos
Fil: Watermann, J.F.. Danmarks Meteorologiske Institut; Dinamarca
Materia
Magnetopause
Tangential Discontinuity
Vortex Sheet
Northward IMF
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/61488
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/61488
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observationsFarrugia, C. J.Gratton, Fausto Tulio LivioLund, E.J.Sandholt, P.E.Cowley, S.W.H.Torbert, R.B.Gnavi, Graciela DeliaMann, I.R.Bilbao, Luis ErnestoMouikis, C.Kistler, L.Smith, C.W.Singer, H.J.Watermann, J.F.MagnetopauseTangential DiscontinuityVortex SheetNorthward IMFhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We 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.Fil: Farrugia, C. J.. University Of New Hampshire Durham;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; ArgentinaFil: Lund, E.J.. University Of New Hampshire Durham; Reino UnidoFil: Sandholt, P.E.. University of Oslo; NoruegaFil: Cowley, S.W.H.. University of Leicester; Reino UnidoFil: Torbert, R.B.. University Of New Hampshire Durham; Reino UnidoFil: 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; ArgentinaFil: Mann, I.R.. University of Alberta; CanadáFil: 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; ArgentinaFil: Mouikis, C.. University Of New Hampshire Durham; Reino UnidoFil: Kistler, L.. University Of New Hampshire Durham; Reino UnidoFil: Smith, C.W.. University Of New Hampshire Durham;Fil: Singer, H.J.. National Oceanic And Atmospheric Administration; Estados UnidosFil: Watermann, J.F.. Danmarks Meteorologiske Institut; DinamarcaBlackwell Publishing Ltd2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/61488Farrugia, 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; 1-152169-9402CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1029/2007JA012800info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:24:49Zoai:ri.conicet.gov.ar:11336/61488instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:24:49.302CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
title Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
spellingShingle Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
Farrugia, C. J.
Magnetopause
Tangential Discontinuity
Vortex Sheet
Northward IMF
title_short Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
title_full Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
title_fullStr Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
title_full_unstemmed Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
title_sort Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
dc.creator.none.fl_str_mv Farrugia, C. J.
Gratton, Fausto Tulio Livio
Lund, E.J.
Sandholt, P.E.
Cowley, S.W.H.
Torbert, R.B.
Gnavi, Graciela Delia
Mann, I.R.
Bilbao, Luis Ernesto
Mouikis, C.
Kistler, L.
Smith, C.W.
Singer, H.J.
Watermann, J.F.
author Farrugia, C. J.
author_facet Farrugia, C. J.
Gratton, Fausto Tulio Livio
Lund, E.J.
Sandholt, P.E.
Cowley, S.W.H.
Torbert, R.B.
Gnavi, Graciela Delia
Mann, I.R.
Bilbao, Luis Ernesto
Mouikis, C.
Kistler, L.
Smith, C.W.
Singer, H.J.
Watermann, J.F.
author_role author
author2 Gratton, Fausto Tulio Livio
Lund, E.J.
Sandholt, P.E.
Cowley, S.W.H.
Torbert, R.B.
Gnavi, Graciela Delia
Mann, I.R.
Bilbao, Luis Ernesto
Mouikis, C.
Kistler, L.
Smith, C.W.
Singer, H.J.
Watermann, J.F.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Magnetopause
Tangential Discontinuity
Vortex Sheet
Northward IMF
topic Magnetopause
Tangential Discontinuity
Vortex Sheet
Northward IMF
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Farrugia, C. J.. University Of New Hampshire Durham;
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
Fil: Lund, E.J.. University Of New Hampshire Durham; Reino Unido
Fil: Sandholt, P.E.. University of Oslo; Noruega
Fil: Cowley, S.W.H.. University of Leicester; Reino Unido
Fil: Torbert, R.B.. University Of New Hampshire Durham; Reino Unido
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
Fil: Mann, I.R.. University of Alberta; Canadá
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
Fil: Mouikis, C.. University Of New Hampshire Durham; Reino Unido
Fil: Kistler, L.. University Of New Hampshire Durham; Reino Unido
Fil: Smith, C.W.. University Of New Hampshire Durham;
Fil: Singer, H.J.. National Oceanic And Atmospheric Administration; Estados Unidos
Fil: Watermann, J.F.. Danmarks Meteorologiske Institut; Dinamarca
description 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.
publishDate 2008
dc.date.none.fl_str_mv 2008-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/61488
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
2169-9402
CONICET Digital
CONICET
url http://hdl.handle.net/11336/61488
identifier_str_mv 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
2169-9402
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JA012800
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Blackwell Publishing Ltd
publisher.none.fl_str_mv Blackwell Publishing Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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