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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 6
Ann. Geophys., 17, 707–711, 1999
https://doi.org/10.1007/s00585-999-0707-z
© European Geosciences Union 1999
Ann. Geophys., 17, 707–711, 1999
https://doi.org/10.1007/s00585-999-0707-z
© European Geosciences Union 1999

  30 Jun 1999

30 Jun 1999

A flux transfer event observed at the magnetopause by the Equator-S spacecraft and in the ionosphere by the CUTLASS HF radar

D. A. Neudegg1, T. K. Yeoman1, S. W. H. Cowley1, G. Provan1, G. Haerendel2, W. Baumjohann2, U. Auster3, K.-H. Fornacon3, E. Georgescu4, and C. J. Owen5 D. A. Neudegg et al.
  • 1Department of Physics and Astronomy, Leicester University, University Road, Leicester LE1 7RH
  • E-mail: dan2@ion.le.ac.uk
  • 2Max-Planck Institut für Extraterrestrische Physik, Garching, Munich, Germany
  • 3Technische Universität von Braunschweig, Braunschweig, Germany
  • 4ISS, Bucharest, Romania
  • 5Queen Mary and Westfield College, London, UK

Abstract. Observations of a flux transfer event (FTE) have been made simultaneously by the Equator-S spacecraft near the dayside magnetopause whilst corresponding transient plasma flows were seen in the near-conjugate polar ionosphere by the CUTLASS Finland HF radar. Prior to the occurrence of the FTE, the magnetometer on the WIND spacecraft ~226 RE upstream of the Earth in the solar wind detected a southward turning of the interplanetary magnetic field (IMF) which is estimated to have reached the subsolar magnetopause ~77 min later. Shortly afterwards the Equator-S magnetometer observed a typical bipolar FTE signature in the magnetic field component normal to the magnetopause, just inside the magnetosphere. Almost simultaneously the CUTLASS Finland radar observed a strong transient flow in the F region plasma between 78° and 83° magnetic latitude, near the ionospheric region predicted to map along geomagnetic field lines to the spacecraft. The flow signature (and the data set as a whole) is found to be fully consistent with the view that the FTE was formed by a burst of magnetopause reconnection.

Key words. Interplanetary physics (ionosphere-magnetosphere interaction) · Magnetospheric physics (magnetopause · cusp · and boundary layers; solar wind-magnetosphere interactions)

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