Abstract
The effects of geomagnetic activity on F-region ionization are investigated by calculating correlations between F-region parameters and the Kp-index, including delays of up to 33 hours. At Kingston, Jamaica, total electron content values are used, while at Ottawa, Churchill and Resolute Bay tabulated values of foF2 are subjected to correlation. The correlations are evaluated for each hour of the day in groups of two months so that seasonal variations can also be detected. Results indicate that it may be possible to separate geomagnetic effects according to whether the lag between Kp and the ionospheric effect is short (0–6 h), medium (9–18 h), or long (21–30 h). The various processes which might correspond to these categories are discussed and applied to the results from the four stations mentioned above.
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