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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 9
Ann. Geophys., 25, 2045–2051, 2007
https://doi.org/10.5194/angeo-25-2045-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 2045–2051, 2007
https://doi.org/10.5194/angeo-25-2045-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Oct 2007

02 Oct 2007

Daily variation at Concordia station (Antarctica) and its dependence on IMF conditions

L. Cafarella1, D. Di Mauro1, S. Lepidi1, A. Meloni1, M. Pietrolungo1, L. Santarelli1, and J. J. Schott2 L. Cafarella et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
  • 2Ecole et Observatoire des Science de la Terre, IPG, Strasbourg, France

Abstract. After some short test surveys, during the 2004–2005 summer expedition in Antarctica, a geomagnetic French-Italian observatory was installed on the plateau (geographic coordinates: 75.1° S, 123.4° E; corrected geomagnetic coordinates: 88.9° S, 54.3° E; UT=LT−8) very close to the geomagnetic pole. In this paper we present some peculiarities of the daily variation as observed at this polar cap observatory during the years 2005 and 2006, taking into account the different Loyd seasons and different interplanetary magnetic field conditions. Some interesting results emerge from the analysis, confirming the dependence of the daily variation (and of the associated polar current systems) on the IMF Bz and By components. In particular the analysis showed that different Bz conditions correspond to different contribution to daily variation of ionospheric and field aligned currents, while particular By conditions lead to a time shift of the diurnal variation, indicating an asymmetry with respect to the noon meridian.

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