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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 2
Ann. Geophys., 24, 707–723, 2006
https://doi.org/10.5194/angeo-24-707-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 707–723, 2006
https://doi.org/10.5194/angeo-24-707-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Mar 2006

23 Mar 2006

Coordinated observation of field line resonance in the mid-tail

Y. Zheng1, A. T. Y. Lui1, I. R. Mann2, K. Takahashi1, J. Watermann3, S.-H. Chen4, I. J. Rae2, T. Mukai5, C. T. Russell6, A. Balogh7, R. F. Pfaff8, and H. Rème9 Y. Zheng et al.
  • 1JHU/APL, Laurel, MD 20723-6099, USA
  • 2Space Physics Group, Department of Physics, University of Alberta, Edmonton, Alberta, Canada
  • 3Atmosphere Space Research Division, Danish Meteorological Institute, Denmark
  • 4Universities Space Research Association, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 5ISAS/JAXA, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
  • 6Institute of Geophysics and Planetary Physics /UCLA, Los Angeles CA 90024-1567, USA
  • 7Imperial College, Department of Space and Atmospheric Physics, London, UK
  • 8Laboratory for Solar and Space Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • 9CESR, BP4346, 31028 Toulouse Cedex 4, Toulouse, France

Abstract. Standing Alfvén waves of 1.1 mHz (~15 min in period) were observed by the Cluster satellites in the mid-tail during 06:00-07:00 UT on 8 August 2003. Pulsations with the same frequency were also observed at several ground stations near Cluster's footpoint. The standing wave properties were determined from the electric and magnetic field measurements of Cluster. Data from the ground magnetometers indicated a latitudinal amplitude and phase structure consistent with the driven field line resonance (FLR) at 1.1 mHz. Simultaneously, quasi-periodic oscillations at different frequencies were observed in the post-midnight/early morning sector by GOES 12 (l0≈8.7), Polar (l0≈11-14) and Geotail (l0≈9.8). The 8 August 2003 event yields rare and interesting datasets. It provides, for the first time, coordinated in situ and ground-based observations of a very low frequency FLR in the mid-tail on stretched field lines.

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