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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 12
Ann. Geophys., 27, 4379–4389, 2009
https://doi.org/10.5194/angeo-27-4379-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 4379–4389, 2009
https://doi.org/10.5194/angeo-27-4379-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 02 Dec 2009

ANGEO Communicates | 02 Dec 2009

Modelling of mirror mode structures as propagating slow magnetosonic solitons

K. Stasiewicz1,2,3 and C. Z. Cheng1 K. Stasiewicz and C. Z. Cheng
  • 1National Cheng Kung University, Tainan, Taiwan
  • 2Swedish Institute of Space Physics, Uppsala, Sweden
  • 3Space Research Centre, Polish Academy of Sciences, Warsaw, Poland

Abstract. Cluster measurements in the magnetosheath with spacecraft separations of 2000 km indicate that magnetic pulsations interpreted as mirror mode structures are not frozen in plasma flow, but do propagate with speeds of up to ~50 km/s. Properties of these pulsations are shown to be consistent with propagating slow magnetosonic solitons. By using nonlinear two fluid theory we demonstrate that the well known classical mirror instability condition corresponds to a small subset in a continuum of exponentially varying solutions. With the measured plasma moments we have determined parameters of the polybaric pressure model in the region of occurrence of mirror type structures and applied it to numerical modelling of these structures. In individual cases we obtain excellent agreement between observed mirror mode structures and numerical solutions for magnetosonic solitons.

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