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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 19, issue 3
Ann. Geophys., 19, 311–320, 2001
https://doi.org/10.5194/angeo-19-311-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 19, 311–320, 2001
https://doi.org/10.5194/angeo-19-311-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 2001

31 Mar 2001

Compressional Pc5 type pulsations in the morningside plasma sheet

A. Vaivads*,1, W. Baumjohann1, G. Haerendel1, R. Nakamura1, H. Kucharek1, B. Klecker1, M. R. Lessard2, L. M. Kistler3, T. Mukai4, and A. Nishida4 A. Vaivads et al.
  • 1Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
  • 2Dartmouth College, Thayer School of Engineering, Hanover, USA
  • 3Space Science Center, University of New Hampshire, USA
  • 4Institute for Space and Astronautical Science, Sagamihara, Japan
  • *Now at: Swedish Institute of Space Physics, Uppsala Division, Box 537, SE-75121 Uppsala, Sweden
  • Correspondence to: A. Vaivads (andris@irfu.se)

Abstract. We study compressional pulsations in Pc5 frequency range observed in the dawn-side at distances of about 10 RE , close to the magnetic equator. We use data obtained during two events of conjunctions between Equator-S and Geotail: 1000–1700 UT on 9 March 1998, and 0200–0600 UT on 25 April 1998. In both events, pulsations are observed after substorm activity. The pulsations are antisymmetric with respect to the equatorial plane (even mode), and move eastward with phase velocity close to plasma velocity. The pulsations tend to be pressure balanced. We also discuss possible generation mechanisms of the pulsations.

Key words. Magnetospheric physics (magnetospheric configuration and dynamics; MHD waves and instabilities; plasma sheet)

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