A revised approach to the oF2 long-term trends analysisReport as inadecuate




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1 Institute of Terrestrial Magnetism 2 Atmospheric Sounding Station ?El Arenosillo- 3 Faculty of Physics

Abstract : A new approach to extract foF2 long-term trends, which are free to a great extent from solar and geomagnetic activity effects, has been proposed. These trends are insensitive to the phase increasing-decreasing of geomagnetic activity, with long-term variations being small and insignificant for such relatively short time periods. A small but significant residual foF2 trend, with the slope Kr = - 2.2 × 10-4 per year, was obtained over a 55-year period the longest avail-able of observations at Slough. Such small trends have no practical importance. On the other hand, negative although insignificant residual trends obtained at 10 ionosonde stations for shorter periods 31 years may be considered as a manifestation of a very long-term geomagnetic activity increase which did take place during the 20th century. All of the revealed foF2 long-term variations trends are shown to have a natural origin related to long-term variations in solar and geomagnetic activity. There is no indication of any manmade foF2 trends. Key words. Ionosphere ionosphere-atmosphere interactions, ionospheric disturbances





Author: A. V. Mikhailov - D. Marin - T. Yu. Leschinskaya - M. Herraiz -

Source: https://hal.archives-ouvertes.fr/



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