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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 8
Ann. Geophys., 16, 1039–1042, 1998
https://doi.org/10.1007/s00585-998-1039-0
© European Geosciences Union 1998
Ann. Geophys., 16, 1039–1042, 1998
https://doi.org/10.1007/s00585-998-1039-0
© European Geosciences Union 1998

  31 Aug 1998

31 Aug 1998

Letter to the Editor: Solar-cycle variation of the daily foF2 and M(3000)F2

S. S. Kouris1, P. A. Bradley2, and P. Dominici3 S. S. Kouris et al.
  • 1Aristotle University of Thessaloniki, Department of Electrical Engineering and Computer Engineering, Telecommunications Division, GR-540 06 Thessaloniki, Greece
  • 2Consultant, formerly Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK
  • 3Physics Department, University of Rome "La Sapienza", Italy

Abstract. Daily values of the ionospheric characteristics foF2 and M(3000)F2 for a given hour and month are correlated with the corresponding daily values of sunspot number using measured data collected at seven European locations. The significance of applying different-order polynomials is considered and the times are confirmed when the higher-order terms are important. Mean correlation coefficients for combined data sets over all hours, months and stations are determined, together with the standard errors of estimates. Comparisons are made with corresponding figures for monthly median values derived from the same data sets.

Key words. Electromagnetics (Guided waves) · Ionosphere (Ionospheric disturbances) · Radio Science (Radio wave propagation)

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