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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 2
Ann. Geophys., 22, 643-651, 2004
https://doi.org/10.5194/angeo-22-643-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 643-651, 2004
https://doi.org/10.5194/angeo-22-643-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Jan 2004

01 Jan 2004

An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations

K. Prikner1, K. Mursula2, J. Kangas2, R. Kerttula2, and F. Z. Feygin3 K. Prikner et al.
  • 1Geophysical Institute, Academy of Sciences of the Czech Republic, Bocni II, 14131 Praha 4, Sporilov, Czech Republic
  • 2Department of Physical Sciences, University of Oulu, P. O. Box 3000, FIN-90014 Oulu, Finland
  • 3United Institute of Physics of the Earth, Russian Academy of Sciences, Bolshaya Gruzinskaya 10, 123810 Moscow, Russia

Abstract. On 2 December 1999, the magnetometer stations in northern Finland registered structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous EISCAT radar measurements of the high-latitude ionosphere, we have studied the ionospheric resonator properties during this multiband Pc1 event. The frequencies of the three structured Pc1 bands were found to closely correspond to the second, third and fourth harmonic of the calculated fundamental frequency of the ionospheric Alfvén resonator (IAR). In addition, those frequencies of the three pearl bands that were closest to the exact IAR harmonics were found to have the strongest intensities. The results demonstrate that the resonator can have an important role on ground-based Pc1 activity over a notably large frequency range, favoring transmission of waves with frequencies close to the resonator's eigenfrequencies. Since the frequencies of all three bands correspond to the maximum rather than the minimum of the transmission coefficient, the traditional bouncing wave packet model needs to be revised.

Key words. Ionosphere (auroral ionosphere; ionosphere magnetosphere interactions; wave propagation)

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