Solar Cycle variations of foF2 from IGY to 1990

Details Solar Cycle variations of foF2 from IGY to 1990 Solar Cycle variations of foF2 from IGY to 1990

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002angeo..20.1677s&link_type=abstract

Annales Geophysicae, vol. 20, Issue 10, pp.1677-1685

Physics

11

Scientific paper

Noontime monthly median values of F2-layer critical frequency foF2 (m) for some ionospheric stations representing low- and mid-latitudes are examined for their dependence on solar activity for the years 1957 (IGY) to 1990. This is the period for which ionospheric data in digital form is available in two CD-ROMs at the World Data Center, Boulder. It is observed that at mid-latitudes, foF2 (m) shows nearly a linear relationship with R12 (the 12-month running average of the Zurich sunspot number), though this relation is nonlinear for low-latitudes. These results indicate some departures from the existing information often used in theoretical and applied areas of space research.

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