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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 8
Ann. Geophys., 25, 1887–1897, 2007
https://doi.org/10.5194/angeo-25-1887-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1887–1897, 2007
https://doi.org/10.5194/angeo-25-1887-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Aug 2007

29 Aug 2007

Near-simultaneous magnetotail flux rope observations with Cluster and Double Star

A. P. Walsh1, A. N. Fazakerley1, R. J. Wilson1,2, I. V. Alexeev1, P. D. Henderson1, C. J. Owen1, E. Lucek3, C. Carr3, and I. Dandouras4 A. P. Walsh et al.
  • 1Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT, UK
  • 2Los Alamos National Laboratory, Los Alamos, New Mexico, USA
  • 3Space and Atmospheric Physics, Imperial College London, SW7 2BZ, UK
  • 4Centre d'Etude Spatiale des Rayonnements, Toulouse, France

Abstract. We present observations of three magnetic flux ropes in the tail of the Earth's magnetosphere on 7 August 2004 by the Cluster and Double Star TC-1 spacecraft. The first two flux rope signatures were observed, near-simultaneously, by Cluster and TC-1, which were located at (–16.3, –8.7, 0.10) RE GSM and (–10.3, –7.11, 0.81) RE GSM, respectively, a separation of 6.3 RE. A third signature was observed some four minutes later by two of the four Cluster spacecraft, while the other two spacecraft observed a feature resembling a Travelling Compression Region (TCR). These observations are interpreted as three individual flux ropes existing in the magnetotail, the first two, at least, simultaneously. The formation mechanism of the flux ropes and the consequences of their presence for the structure of the magnetotail on this day are discussed in the context of multiple X-point reconnection.

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