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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 4
Ann. Geophys., 20, 511-521, 2002
https://doi.org/10.5194/angeo-20-511-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 511-521, 2002
https://doi.org/10.5194/angeo-20-511-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Apr 2002

30 Apr 2002

The method of determination of the long-term trends in the F2 region independent of geomagnetic activity

A. D. Danilov A. D. Danilov
  • Institute of Applied Geophysics, Rostokinskays 9, Moscow 129 128, Russia
  • Correspondence to: A. D. Danilov (adanilov99@mail.ru)

Abstract. A detailed analysis of the f oF2 data at the Sverdlovsk station is performed to answer the question: whether the long-term trends of the F2-layer parameter detected recently are mainly due to the long-term changes in geomagnetic activity during the recent decades. Two methods to derive trends independent of geomagnetic activity are developed. It is found that both methods agree well and give a relative nongeomagnetic trend of about - 0.0015 per year (or an absolute nongeomagnetic trend of about - 0.015 MHz per year). The close relation of foF2 to Ap found by several authors is mainly due to a high correlation between the foF2 deviations from the regression line and year-to-year changes in the Ap index rather than to systematic long-term changes of Ap as has been suggested earlier.

Key words. Ionosphere (ionospheric distances; modeling and forecasting)

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