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http://hdl.handle.net/2122/3498| 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 Classification: | 01. 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. |
| Appears in Collections: | Article published / in press |
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