Solar cycle variations of annual mean noon foF2

Details Solar cycle variations of annual mean noon foF2 Solar cycle variations of annual mean noon foF2

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...79m&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 2, p. 79-82

Physics

13

Annual Variations, Extreme Ultraviolet Radiation, F 2 Region, Geomagnetism, Solar Cycles, Solar Flux, Solar Terrestrial Interactions, Hysteresis, Solar Radiation

Scientific paper

Variations in the solar of the solar Extreme Ultraviolet (EUV) flux (represented by F10.7, the Covington index) are shown to control annual mean foF2 cycle variations to great extent. Counterclockwise in cycle 19 and clockwise in cycle 21 EUV flux hysteresis loops result in corresponding foF2 solar cycle variations, the latter being changed by the F2-layer storm effects due to enhanced geomagnetic activity during the falling phase of a solar cycle. Regular changes of the foF2 values corresponding to a particular level of solar activity during the rising phases of solar cycles 19-22 result from different EUV flux variations in small and big solar cycles.

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