Abstract
Ionospheric electron content (IEC) and slab thickness (τ) data for the period 1977 to 1980 from Lunping (23.03°N; 121.90°E subionospheric) have been examined for their solar activity dependence. Local noontime monthly means as well as values for the 5 QQ days in a month have been examined separately with different solar indices, namely: solar EUV flux (170–190 A),S10.7 cm flux and sun spot number (SSN) on a seasonal basis. Both IEC and τ parameters exhibit better correlation with solar EUV andS10.7 cm fluxes than with SSN for all seasons. IEC increases linearly with both EUV andS10.7 cm flux whereas with SSN it shows a distinct nonlinear relationship during all seasons in both monthly mean and 5 QQ days' values. This study indicates that for correlating and predicting the variations (especially the medium term) in the ionospheric parameters, both EUV andS10.7 cm fluxes have an advantage over SSN.
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