Within-the-hour variability: levels and their probabilities
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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.
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.
Article Details
How to Cite
1.
Kouris SS, Polimeris KV, Romano V, Zolesi B, Cander LR. Within-the-hour variability: levels and their probabilities. Ann. Geophys. [Internet]. 2006Dec.25 [cited 2022Jan.25];49(4-5). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3108
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