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A 22-year Cycle in the F Layer Ionization of the Ionosphere : Volume 15, Issue 8 (30/11/-0001)

By Feichter, E.

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Book Id: WPLBN0003981923
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: A 22-year Cycle in the F Layer Ionization of the Ionosphere : Volume 15, Issue 8 (30/11/-0001)  
Author: Feichter, E.
Volume: Vol. 15, Issue 8
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Feichter, E., & Leitinger, R. (-0001). A 22-year Cycle in the F Layer Ionization of the Ionosphere : Volume 15, Issue 8 (30/11/-0001). Retrieved from

Description: Institut für Meteorologie und Geophysik, Universität Graz, Halbärthgasse 1, A-8010 Graz, Austria Tel: +43 316 380 5257; Fax: +43 316 384091;
e-mail: The double-sunspot-cycle variation in terrestrial magnetic activity has been well known for about 30 years. In 1990 we examined and compared the low-solar-activity (LSA) part of two consecutive cycles and predicted from this database and from published results the existence of a double-sunspot-cycle variation in total electron content (TEC) of the ionosphere too. This is restricted to noontime when the semi-annual component is well developed. Since 1995 we have had enough data for the statistical processing for high-solar-activity (HSA) conditions of two successive solar cycles. The results confirm the LSA findings. The annual variation of TEC shows a change from an autumn maximum in cycle 21 to a spring maximum during the next solar cycle. Similar to the aa indices for geomagnetic activity the TEC data show a phase change in the 1-year component of the Fourier transform of the annual variation. Additionally we found the same behaviour in the F-layer peak electron density (Nmax) over four solar cycles. This indicates that there exists a double-sunspot-cycle variation in the F-layer ionization over Europe too. It is very likely coupled with the 22-year cycle in geomagnetic activity.

A 22-year cycle in the F layer ionization of the ionosphere


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