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Farrugia, C.J.; Gratton, F.T.; Lund, E.J.; Sandholt, P.E.; Cowley, S.W.H.; Torbert, R.B.; Gnavi, G.; Mann, I.R.; Bilbao, L.; Mouikis, C.; Kistler, L.; Smith, C.W.; Singer, H.J.; Watermann, J.F. "Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations" (2008) Journal of Geophysical Research: Space Physics. 113(3)
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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.

Registro:

Documento: Artículo
Título:Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations
Autor:Farrugia, C.J.; Gratton, F.T.; Lund, E.J.; Sandholt, P.E.; Cowley, S.W.H.; Torbert, R.B.; Gnavi, G.; Mann, I.R.; Bilbao, L.; Mouikis, C.; Kistler, L.; Smith, C.W.; Singer, H.J.; Watermann, J.F.
Filiación:Space Science Center, University of New Hampshire, Durham, NH, United States
Department of Physics, University of New Hampshire, Durham, NH, United States
Instituto de Fisica Del Plasma, CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de la Fisica, Pontificia Universidad Catolica Argentina, Buenos Aires, Argentina
Department of Physics, University of Oslo, Oslo, Norway
Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Avadh Bhatia Physics Laboratory, Department of Physics, University of Alberta, Edmonton, AB, Canada
NOAA Space Environment Center, Boulder, CO, United States
Geomagnetism and Space Physics Program, Danish Meteorological Institute, Kobenhavn, Denmark
Instituto de Fisica del Plasma, CONICET, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Deptartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
Space Science Center, University of New Hampshire, Durham, NH 03824, United States
Avadh Bhatia Physics Laboratory, Department of Physics, University of Alberta, Edmonton, AB T6G 2J1, Canada
Department of Physics, University of Oslo, Oslo N-0317, Norway
NOAA Space Environment Center, 325 Broadway Street, Boulder, CO 80305, United States
Geomagnetism and Space Physics Program, Danish Meteorological Institute, Lyngbyvej 100, Copenhagen, DK-2100, Denmark
Año:2008
Volumen:113
Número:3
DOI: http://dx.doi.org/10.1029/2007JA012800
Título revista:Journal of Geophysical Research: Space Physics
Título revista abreviado:J. Geophys. Res. A. Space Phys.
ISSN:21699402
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699402_v113_n3_p_Farrugia

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Citas:

---------- APA ----------
Farrugia, C.J., Gratton, F.T., Lund, E.J., Sandholt, P.E., Cowley, S.W.H., Torbert, R.B., Gnavi, G.,..., Watermann, J.F. (2008) . Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations. Journal of Geophysical Research: Space Physics, 113(3).
http://dx.doi.org/10.1029/2007JA012800
---------- CHICAGO ----------
Farrugia, C.J., Gratton, F.T., Lund, E.J., Sandholt, P.E., Cowley, S.W.H., Torbert, R.B., et al. "Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations" . Journal of Geophysical Research: Space Physics 113, no. 3 (2008).
http://dx.doi.org/10.1029/2007JA012800
---------- MLA ----------
Farrugia, C.J., Gratton, F.T., Lund, E.J., Sandholt, P.E., Cowley, S.W.H., Torbert, R.B., et al. "Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations" . Journal of Geophysical Research: Space Physics, vol. 113, no. 3, 2008.
http://dx.doi.org/10.1029/2007JA012800
---------- VANCOUVER ----------
Farrugia, C.J., Gratton, F.T., Lund, E.J., Sandholt, P.E., Cowley, S.W.H., Torbert, R.B., et al. Two-stage oscillatory response of the magnetopause to a tangential discontinuity/vortex sheet followed by northward IMF: Cluster observations. J. Geophys. Res. A. Space Phys. 2008;113(3).
http://dx.doi.org/10.1029/2007JA012800