Abstract. Continuous observations in the ionospheric E and F regions have been regularly carried out since the ®fties of this century at many ionosonde stations. Using these data from 31 European stations long-term trends have been derived for dierent parameters of the ionospheric E layer (h¢ E, foE), F1 layer (foF1) and F2 layer (hmF2, foF2). The detected trends in the E and F1 layers (lowering of the E region height h¢E; increase of the peak electron densities of the E and F1 layers, foE and foF1) are in qualitative agreement with model predictions of an increasing atmospheric greenhouse eect. In the F2 region, however, the results are more complex. Whereas in the European region west of 30°E negative trends in hmF2 (peak height of the F2 layer) and in the peak electron density (foF2) have been found, in the eastern part of Europe (east of 30°E) positive trends dominate in both parameters. These marked longitudinal dierences cannot be explained by an increasing greenhouse eect only, here probably dynamical eects in the F2 layer seem to play an essential role.
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