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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, 321–325, 2001
https://doi.org/10.5194/angeo-19-321-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 19, 321–325, 2001
https://doi.org/10.5194/angeo-19-321-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 2001

31 Mar 2001

Pc5 geomagnetic field fluctuations at discrete frequencies at a low latitude station

U. Villante1, P. Francia1, and S. Lepidi2 U. Villante et al.
  • 1Dipartimento di Fisica, Universita’ dell’Aquila, L’Aquila, Italy
  • 2Istituto Nazionale di Geofisica, L’Aquila, Italy
  • Correspondence to: P. Francia, (patrizia.francia@aquila.infn.it)

Abstract. A statistical analysis of the geomagnetic field fluctuations in the Pc5 frequency range (1–5 mHz) at a low latitude station (L = 1.6) provides further evidence for daytime power peaks at discrete frequencies. The power enhancements, which become more pronounced during high solar wind pressure conditions, may be interpreted in terms of ground signatures of magnetospheric cavity/waveguide compressional modes driven by solar wind pressure pulses. In this sense, the much clearer statistical evidence for afternoon events can be related to corotating structures mainly impinging the postnoon magnetopause. A comparison with results obtained for the same time intervals from previous investigations at higher latitudes and in the Earth’s magnetosphere confirms the global character of the observed modes.

Key words. Magnetospheric physics (MHD waves and instabilities; solar wind-magnetospheric interactions)

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