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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 19, issue 10/12
Ann. Geophys., 19, 1399–1409, 2001
https://doi.org/10.5194/angeo-19-1399-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: CLUSTER

Ann. Geophys., 19, 1399–1409, 2001
https://doi.org/10.5194/angeo-19-1399-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Sep 2001

30 Sep 2001

Cluster magnetic field observations of the bowshock: Orientation, motion and structure

T. S. Horbury1, P. J. Cargill1, E. A. Lucek1, A. Balogh1, M. W. Dunlop1, T. M. Oddy1, C. Carr1, P. Brown1, A. Szabo2, and K.-H. Fornaçon3 T. S. Horbury et al.
  • 1The Blackett Laboratory, Imperial College, London, UK
  • 2Goddard Space Flight Center, Greenbelt, MD, USA
  • 3Technische Universität Braunschweig, Braunschweig, Germany

Abstract. Four spacecraft Cluster magnetic field observations of the low <beta> quasi-perpendicular terrestrial bowshock are presented for the first time. Multiple quasi-perpendicular crossings on 25 December 2000 are analysed. By combining data from the four spacecraft, bowshock orientations and velocities can be calculated. It is shown that, even while in rapid motion, the bowshock normal direction remains remarkably constant, and that coplanarity estimates are accurate to, typically, around 20°. Magnetic field magnitude profiles are shown to be very well correlated between spacecraft although downstream waves with fluctuations perpendicular to the local field, while statistically similar at all four spacecraft, are poorly correlated on separation scales of several hundred km. Examples are shown of a number of bowshock phenomena, including non-standing fluctuations in the shock foot and the shock interacting with changing solar wind conditions.

Key words. Interplanetary physics (planetary bow shocks) Space plasma physics (shock waves; waves and instabilities)

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