Abstract
The quiet time solar cycle variability of ionospheric radio wave absorption of 2. 132 MHz at Delhi is compared with the absorption calculated by using the well known aeronomical (six-ion) and empirical (IRI-1990) models of electron density profiles and standard collision frequency distributions. It is found that the observed increase of absorption in solar cycle 21 22 is by a factor of 2.5 greater than values computed with IRI. These latter are almost satisfactory for low and moderate values of the 1–8 Å solar X-ray flux. Absorption and X-ray flux are well correlated for low and moderate, not so for high flux values.
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