Abstract Based on the comparison of solar activity indices (annual average values of the relative number of sunspots Rz12 and solar radio emission flux at a wavelength of 10.7 cm F12) with the ionospheric index of solar activity IG12 for 1954–2013, we have found that the index F12 is a more accurate (than Rz12) indicator of solar activity for the long-term forecast of foF2 (the critical frequency of the F2-layer). This advantage of the F12 index becomes especially significant after 2000 if the specific features of extreme ultraviolet radiation of the Sun are additionally taken into account in the minima of solar cycles, using an appropriate correction to F12. Qualitative arguments are given in favor of the use of F12 for the long-term forecast of both foF2 and other ionospheric parameters.


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    Title :

    Solar activity index for long-term ionospheric forecasts


    Contributors:

    Published in:

    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.60 Raumfahrttechnik / 39.00 Astronomie: Allgemeines / 50.93 Weltraumforschung
    Local classification TIB:    770/3520/8000