Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2986
AuthorsAlfonsi, Lu.* 
De Franceschi, G.* 
De Santis, A.* 
TitleGeomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
Issue Date2007
URIhttp://hdl.handle.net/2122/2986
KeywordsLong term trends
polar ionosphere
monlinear phenomena
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction 
AbstractThe 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.
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