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Abstract:

We describe (i) perturbations of the magnetopause/magnetosphere elicited by an interplanetary discontinuity and (ii) the production of Kelvin-Helmholtz waves on the magnetopause. These are two large topics, so for reasons of space we combine both features in a single data example, supporting the observations by theory. Correspondingly, the observations, made by ACE, consist of an interval in which a current sheet is followed by a period of strongly northward IMF. In view of recent attention directed at the effect of variations of the azimuthal component of the solar wind velocity on the magnetosphere, we chose a current sheet (CS) across which the east-west components of both field and flow vectors change polarity. A two-stage response is evident in the records of Cluster, outbound at the dusk terminator at 27° MLAT: (i) Four cycles of large-amplitude, ~3min oscillations during which the spacecraft sample alternately the cold, dense magnetosheath and the hot and tenuous magnetosphere plasmas. We argue that these motions are likely due to tangential stresses applied to the magnetopause. (ii) Soon thereafter the oscillatory character changes dramatically, and ~80s small-amplitude undulations appear which we argue to be magnetopause surface waves. Applying linear MHD theory we show these waves are due to a locally Kelvin-Helmholtz unstable boundary. As input parameters, we take values during the preceding large oscillations at the same magnetopause locale. An aspect of the non-linear phase of this instability is illustrated by a numerical simulation: the reduced duration of the evolution into large vortices by a strong initial perturbation. © 2009 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin-Helmholtz waves
Autor:Farrugia, C.J.; Gratton, F.T.
Filiación:Space Science Center, University of New Hampshire, Durham, NH 03824, United States
Instituto de Física del Plasma, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Dep. de Física, Facultad de Ciencias Fisicomatemáticas e Ingeniería, Pontificia Universidad Católica Argentina, Buenos Aires, Argentina
Palabras clave:Interplanetary discontinuities; Kelvin-Helmholtz instability; Vortex sheets; Azimuthal components; Current sheets; Data examples; Flow vectors; Four cycles; Helmholtz; Initial perturbation; Input parameter; Interplanetary discontinuities; Kelvin-Helmholtz instabilities; Kelvin-Helmholtz waves; Magnetosheaths; Non-linear; Northward IMF; Numerical simulation; Solar wind velocity; Tangential stress; Two stage; Vortex sheet; Helmholtz equation; Interplanetary spacecraft; Solar wind; Surface waves; Vortex flow; Magnetosphere
Año:2011
Volumen:73
Número:1
Página de inicio:40
Página de fin:51
DOI: http://dx.doi.org/10.1016/j.jastp.2009.10.008
Título revista:Journal of Atmospheric and Solar-Terrestrial Physics
Título revista abreviado:J. Atmos. Sol.-Terr. Phys.
ISSN:13646826
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v73_n1_p40_Farrugia

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Citas:

---------- APA ----------
Farrugia, C.J. & Gratton, F.T. (2011) . Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin-Helmholtz waves. Journal of Atmospheric and Solar-Terrestrial Physics, 73(1), 40-51.
http://dx.doi.org/10.1016/j.jastp.2009.10.008
---------- CHICAGO ----------
Farrugia, C.J., Gratton, F.T. "Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin-Helmholtz waves" . Journal of Atmospheric and Solar-Terrestrial Physics 73, no. 1 (2011) : 40-51.
http://dx.doi.org/10.1016/j.jastp.2009.10.008
---------- MLA ----------
Farrugia, C.J., Gratton, F.T. "Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin-Helmholtz waves" . Journal of Atmospheric and Solar-Terrestrial Physics, vol. 73, no. 1, 2011, pp. 40-51.
http://dx.doi.org/10.1016/j.jastp.2009.10.008
---------- VANCOUVER ----------
Farrugia, C.J., Gratton, F.T. Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin-Helmholtz waves. J. Atmos. Sol.-Terr. Phys. 2011;73(1):40-51.
http://dx.doi.org/10.1016/j.jastp.2009.10.008