Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3498
AuthorsAlfonsi, Lu.* 
De Franceschi, G.* 
Perrone, L.* 
Materassi, M.* 
TitleLong Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
Issue Date2002
Series/Report no.6-8/27 (2002)
URIhttp://hdl.handle.net/2122/3498
Keywordslong term trends
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics 
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation 
AbstractAbstract The long-term behaviour of the plasma frequency of the F2 layer, foF2, is investigated to contribute to the discussion about the natural or anthropogenic origin of the ionospheric long-term changes. In this paper, long time series of hourly foF2 data from two high latitude ionospheric observatories of both the hemispheres are analysed. A decreasing trend of foF2 is found confirming a previous result obtained by using the foF2 monthly medians from Antarctic stations. This negative trend does not show a clear dependence on the long-term behaviour of the geomagnetic activity impact on the ionosphere.
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