Unravelling signs of global change in the ionosphere

As a consequence of alterations of atmospheric chemical composition due to anthropogenic emissions, Earth's ionosphere and thermosphere are expected to change. A number of authors tried to detect signs of global change in their ionospheric data, but many findings remain controversial. We briefly review long-term trends observed in the critical frequencies of the ionospheric E and F2 layers as well as in the height of the F2-peak, i.e. the layer of maximum electron density. Using 48 years of F2-layer critical frequency data from Sodankyla, Finland, we demonstrate how the sign and amplitude of the detected trends depend upon the choice of model fitted to the data and suggest a method to choose the best possible model.


Publication status:
Authors: Ulich, T., Clilverd, M.A. ORCIDORCID record for M.A. Clilverd, Jarvis, M.J., Rishbeth, H.

Editors: Lilensten, J.

On this site: Mark Clilverd
1 January, 2007
In: Lilensten, J. (eds.). Space weather: research towards applications in Europe (2007), Dordrecht, Springer, 95-105.