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Ann. Geophys., 24, 707-723, 2006
www.ann-geophys.net/24/707/2006/
© European Geosciences Union 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
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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