In "Space Weather - Research Towards Applications in Europe", Astrophys. Space Sci. Library, Vol. 344, Springer, 2006

Unravelling Signs of Global Chance in the Ionosphere

Th.Ulich1, M. A. Clilverd2, M. J. Jarvis2, H. Rishbeth3

1Sodankylä Geophysical Observatory, Sodankylä, Finland,
2British Antarctic Survey, Cambridge, England, U.K.,
3University of Southampton, Southampton, England, U.K.

Abstract

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 Sodankylš, 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.

Reference:

Ulich, Th., M. A. Clilverd, M. J. Jarvis, H. Rishbeth, Unravelling Signs of Global Chance in the Ionosphere, in "Space Weather - Research Towards Applications in Europe", ed. J. Lilensten, Astrophys. Space Sci. Library, Vol. 344, pp. 95-105, Springer, Dordrecht, The Netherlands, 2006.

ISBN-10 1-4020-5445-9 (HB)
ISBN-10 1-4020-5445-7 (e-book)
ISBN-13 978-1-4020-5445-7 (HB)
ISBN-13 978-1-4020-5446-4 (e-book)

Publisher:

Springer, P.O. Box 17, 3300 AA Dordrecht, The Netherlands, www.springer.com.