Abstract
The study of foF2 data measured every 5-min and of TEC measurements made every 10-min shows that the 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.
Highlights
Perturbations of ionization density at the heights of the ionospheric F-region are permanent features
Variability in TEC – The analysis shows that the within-the-hour variability in TEC has a different behavior from that in foF2
Only an «intrinsic» variability of the order of less than 5% is found, comparative to the one found for all other ionospheric characteristics, e.g. foE (Kouris and Fotiadis, 2002)
Summary
Perturbations of ionization density at the heights of the ionospheric F-region are permanent features. First we evaluate the 10-min relative deviations of TEC from the measured every 10-min daily values in each interval time of an hour (half an hour before and after each standard hour) of each day/month/year/location using the expression dT =
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