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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 10
Ann. Geophys., 20, 1677–1685, 2002
https://doi.org/10.5194/angeo-20-1677-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 1677–1685, 2002
https://doi.org/10.5194/angeo-20-1677-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Oct 2002

31 Oct 2002

Solar Cycle variations of ƒoF2 from IGY to 1990

N. K. Sethi, M. K. Goel, and K. K. Mahajan N. K. Sethi et al.
  • Radio and Atmospheric Sciences Division, National Physical
  • Correspondence to: N. K. Sethi (mksethi@csnpl.ren.nic.in)

Abstract. 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.

Key words. Ionosphere (equatorial ionosphere; mid-latitude ionosphere; modelling and forecasting)

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