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Authors: Alfonsi, Lu.* 
De Franceschi, G.* 
Perrone, L.* 
Materassi, M.* 
Title: Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
Journal: Physics and Chemistry of the Earth 
Series/Report no.: 6-8/27 (2002)
Publisher: Elsevier
Issue Date: 2002
Keywords: long term trends
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics 
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation 
Abstract: Abstract 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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