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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 6
Ann. Geophys., 23, 2259–2264, 2005
https://doi.org/10.5194/angeo-23-2259-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 2259–2264, 2005
https://doi.org/10.5194/angeo-23-2259-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  15 Sep 2005

15 Sep 2005

Flux pile-up and plasma depletion at the high latitude dayside magnetopause during southward interplanetary magnetic field: a cluster event study

T. Moretto1, D. G. Sibeck2, B. Lavraud3, K. J. Trattner4, H. Rème5, and A. Balogh6 T. Moretto et al.
  • 1National Science Foundation, Arlington, Virginia, USA
  • 2Lab. for Solar and Space Physics, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 3Space Science and Applications, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
  • 4Lockheed Martin ATC, Palo Alto, California, USA
  • 5CESR, Toulouse, France
  • 6Imperial College, London, UK

Abstract. An event of strong flux pile-up and plasma depletion at the high latitude magnetopause tailward of the cusp has been analyzed based on observations by the suite of Cluster spacecraft. The multi-satellite analysis facilitates the separation of temporal and spatial features and provides a direct estimate for the strength of the plasma depletion layer for this event. A doubling of the magnetic field strength and a forty percent reduction of the density are found. Our analysis shows that roughly half of the total magnetic field increase occurs within 0.6 RE of the magnetopause and another quarter within a distance of 1.2 RE. In addition, the plasma depletion signatures exhibit temporal variations which we relate to magnetopause dynamics.

Keywords. Magnetospheric physics (Magnetopause, Cusp and boundary layers; Magnetosheath; Solar windmagnetosphere interactions)

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