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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 10
Ann. Geophys., 27, 3765–3780, 2009
https://doi.org/10.5194/angeo-27-3765-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 3765–3780, 2009
https://doi.org/10.5194/angeo-27-3765-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  05 Oct 2009

05 Oct 2009

Magnetosheath cavities: case studies using Cluster observations

F. T. Katırcıoğlu1,2, Z. Kaymaz1, D. G. Sibeck3, and I. Dandouras4,5 F. T. Katırcıoğlu et al.
  • 1İstanbul Technical University, Faculty of Aeronautics and Astronautics, İstanbul, Turkey
  • 2İstanbul Technical University, Eurasia Institute, İstanbul, Turkey
  • 3Goddard Space Flight Center, NASA, Greenbelt, MD, USA
  • 4Université de Toulouse, Centre d'Etude Spatiale des Rayonnements, Toulouse, France
  • 5CNRS, UMR 5187, Toulouse, France

Abstract. This paper presents examples of magnetosheath cavities in Cluster spacecraft observations. The cavities are accompanied by high energy particles in the magnetosheath and characterized by depressed magnetic fields and densities. Flow speeds decrease and temperatures increase within the cavities. All magnetosheath parameters show increased variability within the cavities when the energetic particle flux is high. We predict outward motion of the magnetopause boundary in response to the decreases in the magnetosheath ram pressure caused by the high energy particles within the magnetosheath cavities. For our events, the magnetopause distance is predicted to be 30% larger during the times of high energy particle flux in the magnetosheath than that predicted using concurrent upstream solar wind pressure observations. Our events show no preference to occur for a particular IMF direction or solar wind plasma condition.

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