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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 5
Ann. Geophys., 24, 1455-1468, 2006
https://doi.org/10.5194/angeo-24-1455-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The 11th International Symposium on Equatorial Aeronomy (ISEA-11),...

Ann. Geophys., 24, 1455-1468, 2006
https://doi.org/10.5194/angeo-24-1455-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Jul 2006

03 Jul 2006

ULF fluctuations of the geomagnetic field and ionospheric sounding measurements at low latitudes during the first CAWSES campaign

U. Villante1, M. Vellante1, P. Francia1, M. De Lauretis1, A. Meloni1, P. Palangio1, B. Zolesi1, M. Pezzopane1, M. Förster2, T. L. Zhang3, W. Magnes3, P. Nenovski4, I. Cholakov4, and V. Wesztergom5 U. Villante et al.
  • 1Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy
  • 2GeoForschungsZentrum, Potsdam, Germany
  • 3Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 4Geophysical Institute, Bulgarian Academy of Science, Sofia, Bulgaria
  • 5Geodetic and Geophysical Research Institute of the Hungarian Academy of Science, Sopron, Hungary

Abstract. We present an analysis of ULF geomagnetic field fluctuations at low latitudes during the first CAWSES campaign (29 March-3 April 2004). During the whole campaign, mainly in the prenoon sector, a moderate Pc3-4 pulsation activity is observed, clearly related to interplanetary upstream waves. On 3 April, in correspondence to the Earth's arrival of a coronal mass ejection, two SIs are observed whose waveforms are indicative of a contribution of the high-latitude ionospheric currents to the low-latitude ground field. During the following geomagnetic storm, low frequency (Pc5) waves are observed at discrete frequencies. Their correspondence with the same frequencies detected in the radial components of the interplanetary magnetic field and solar wind speed suggests that Alfvénic solar wind fluctuations may act as direct drivers of magnetospheric fluctuations. A cross-phase analysis, using different pairs of stations, is also presented for identifying field line resonant frequencies and monitoring changes in plasmaspheric mass density. Lastly, an analysis of ionospheric vertical soundings, measured at the Rome ionosonde station (41.8° N, 12.5° E), and vertical TEC measurements deduced from GPS signals within an European network shows the relation between the ULF resonances in the inner magnetosphere and thermal plasma density variations during geomagnetically quiet conditions, in contrast to various storm phases at the end of the CAWSES campaign.

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