Long-term trends in <I>fo</I>F2: their estimating and origin
This paper deals with two problems, methods of <I>fo</I>F2 trend determination and origin of trends in <I>fo</I>F2, both being controversial in current literature. We found that various regression-based methods and artificial neural network-based method of Yue et al. (2006...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-03-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/26/593/2008/angeo-26-593-2008.pdf |
| Summary: | This paper deals with two problems, methods of <I>fo</I>F2 trend
determination and origin of trends in <I>fo</I>F2, both being controversial in
current literature. We found that various regression-based methods and
artificial neural network-based method of Yue et al. (2006) provided
comparable results within uncertainties caused mainly by various ways of
removing/suppressing the dominant solar cycle effect. The role of
geomagnetic activity in the observed trends in <I>fo</I>F2 was probably substantial
and might be still even rather dominant in the last quarter of the 20th
century. |
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| ISSN: | 0992-7689 1432-0576 |