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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 4
Ann. Geophys., 18, 411–415, 2000
https://doi.org/10.1007/s00585-000-0411-5
© European Geosciences Union 2000
Ann. Geophys., 18, 411–415, 2000
https://doi.org/10.1007/s00585-000-0411-5
© European Geosciences Union 2000

  30 Apr 2000

30 Apr 2000

A case study of a radially polarized Pc4 event observed by the Equator-S satellite

R. Cramm1, K. H. Glassmeier1, C. Othmer1, K. H. Fornacon1, H. U. Auster1, W. Baumjohann2, and E. Georgescu3,2 R. Cramm et al.
  • 1Institut für Geophysik und Meteorologie, Technische Universität, Mendelssohnstr. 3, D-38106 Braunschweig, Germany
  • 2Max-Planck-Institut für extraterrestrische Physik, PO Box 1603, D-85740 Garching, Germany
  • 3Institute of Space Sciences, Bucharest, Romania
  • Correspondence to: C. Othmer
  • e-mail: c.othmer@tu-bs.de

Abstract. A 16 mHz Pc4 pulsation was recorded on March 17, 1998, in the prenoon sector of the Earth's magnetosphere by the Equator-S satellite. The event is strongly localized in radial direction at approximately L = 5 and exhibits properties of a field line resonance such as an ellipticity change as seen by applying the method of the analytical signal to the magnetic field data. The azimuthal wave number was estimated as m \approx 150. We discuss whether this event can be explained by the FLR mechanism and find out that the change in ellipticity is more a general feature of a localized Alfvén wave than indicative of a resonant process.

Key words: Magnetospheric physics (MHD waves and instabilities)

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