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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 3
Ann. Geophys., 26, 593–598, 2008
https://doi.org/10.5194/angeo-26-593-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 593–598, 2008
https://doi.org/10.5194/angeo-26-593-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  26 Mar 2008

26 Mar 2008

Long-term trends in foF2: their estimating and origin

J. Laštovička1, X. Yue2,3,4, and W. Wan2 J. Laštovička et al.
  • 1Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, 14131 Prague, Czech Republic
  • 2Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • 3Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
  • 4Graduate School, Chinese Academy of Sciences, Beijing 100049, China

Abstract. This paper deals with two problems, methods of foF2 trend determination and origin of trends in foF2, 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 foF2 was probably substantial and might be still even rather dominant in the last quarter of the 20th century.

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