2002b): Long-term trends of the ionosphere at mid and high latitude regions

In this paper, for investigating on the influence of the geomagnetic activity on the ionospheric long-term trends, an analysis of long series of ionospheric data acquired at mid and high latitude is carried out to verify the previous results obtained over the poles [1,2]. The results are presented, compared and discussed to give another contribution to the general debate on the natural (i.e. long-term enhancement of the geomagnetic activity) and/or anthropogenic origin (i.e. meso-thermospheric cooling due to the greenhouse effect) of the ionospheric trends