Articles | Volume 26, issue 5
Ann. Geophys., 26, 1173–1179, 2008
https://doi.org/10.5194/angeo-26-1173-2008

Special issue: The fourth IAGA-ICMA-CAWSES Workshop "Long-Term Changes and...

Ann. Geophys., 26, 1173–1179, 2008
https://doi.org/10.5194/angeo-26-1173-2008

  28 May 2008

28 May 2008

Geomagnetic and ionospheric data analysis over Antarctica: a contribution to the long term trends investigation

L. Alfonsi, G. De Franceschi, and A. De Santis L. Alfonsi et al.
  • Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, 00143 Rome, Italy

Abstract. The analysis of the foF2 ionosonde data acquired at mid and high latitudes reveals a general decreasing of the F2 plasma frequency over more than two solar cycles, showing steeper trends over the high latitude stations and, in particular, over Antarctica. A careful analysis of the foF2 hourly data, opportunely catalogued in different levels of magneto-ionospheric conditions, highlights the role of the geomagnetic activity in the secular change of the ionosphere and confirms the latitudinal dependence of the trends. These results suggest interesting relations with some recent findings on the rapid decrease of some important physical and statistical quantities related to the geomagnetic field over the whole globe and mainly in Antarctica. In this paper we discuss the possibility of a connection between the ionospheric trends and a possible imminent geomagnetic reversal or excursion.