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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 8
Ann. Geophys., 27, 2997–3005, 2009
https://doi.org/10.5194/angeo-27-2997-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 2997–3005, 2009
https://doi.org/10.5194/angeo-27-2997-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Aug 2009

03 Aug 2009

Magnetosheath excursion and the relevant transport process at the magnetopause

C. L. Cai1,2,3, I. Dandouras1,2, H. Rème1,2, J. B. Cao3,4, G. C. Zhou3, C. Shen3, G. K. Parks5, and D. Fontaine6 C. L. Cai et al.
  • 1University of Toulouse, UPS, CESR, 9 avenue colonel Roche, 31028 Toulouse cedex 4, France
  • 2CNRS, UMR5187, 31028 Toulouse, France
  • 3State Key Laboratory of Space Weather, Center for Space Science and Applied Research, 100080 Beijing, China
  • 4School of Astronautics, Beijing University of Aeronautics and Astronautics, 100191 Beijing, China
  • 5Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
  • 6Centre d'Etudes des Environnements Terrestre et Planétaires, Centre National de la Recherche Scientifique, 78140 Vélizy, France

Abstract. A large-amplitude excursion of the magnetosheath (MS) in quiet solar wind conditions on 17 March 2004 was recorded simultaneously by the Cluster and TC-1 spacecraft. During this period, the IMF Bz was entirely northward. The coherence between the bow shock motion and magnetopause (MP) motion is revealed and the excursion velocities of the bow shock motion are analyzed. In addition, the relevant plasma transport phenomenon in the form of flux fluctuations below the ion gyrofrequency at the MP is exposed and is interpreted as manifestation of the drift instability. Correlated observations on charge accumulation and electrostatic potential perturbation are recorded by electron measurements in high energy regime, and also the eventual cross-field vortex motion in the nonlinear stage and the consequential mass exchange are exhibited. The present investigation gives some new insight into the MS plasma transport mechanism across the subsolar MP region in quiet solar wind conditions during a period of northward IMF.

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