Abstract Based on the comparison of solar activity indices (annual average values of the relative number of sunspots Rz 12 and solar radio emission flux at a wavelength of 10.7 cm F 12) with the ionospheric index of solar activity IG 12 for 1954–2013, we have found that the index F 12 is a more accurate (than Rz 12) indicator of solar activity for the long-term forecast of foF2 (the critical frequency of the F2-layer). This advantage of the F 12 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 F 12. Qualitative arguments are given in favor of the use of F 12 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:

    Cosmic Research ; 54 , 1 ; 1-7


    Publication date :

    2016-01-01


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English