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within-the-hour variability is different in the two parameters. Deciles of this variability for foF2 and for TEC are
determined together with the probabilities of exceeding a given level of variability. Furthermore, considering
hourly values, it is found that the variability in TEC is like an «intrinsic noise» throughout the day of the order
of less than 5% of the hourly value; but at sunrise and often at sunset large values take place. A seasonal dependence
is evident. Besides, a within-the-hour variability in foF2 is always present with large values at sunrise or
sunset depending on the season, and also during disturbed ionospheric conditions.
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