Abstract
The ionospheric electron content (IEC) and peak electron density (NmF2) data collected at low- and mid-latitudes during 1980–1991 and values of solar EUV (50–1050 Å) fluxes obtained from the EUV91 solar EUV flux model are analysed to study the variations of the ionosphere during the intense solar cycles 21 and 22. The study shows that while the ionosphere responds linearly to the solar EUV fluxes its variation with the conventional solar activity index F10.7 is non-linear during both solar cycles. The behaviour of the ionosphere during the most intense solar cycle 19 has been shown to be similar to that during solar cycles 21 and 22 /1/. The ionospheric variations confirm that the relationship between the shorter (EUV and UV) and longer (10.7 cm) wavelength solar fluxes is non-linear during all solar cycles.
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