Abstract
The POGO electrojet data have been analysed for the winter and summer solstitial seasons of the two years, 1968 and 1969, respectively. Our analysis yielded a very large number of values (about 432), each of the electrojet half width, w, its peak current intensity, J 0, and its total eastward current, I +, at 0900–1400 LT in December, and at 1000–1500 LT in June solstitial seasons, respectively. The all-longitude daytime values of the parameters are 246 ± 48 km for w,216 ± 60 A km −1 for J 0, and (58 ± 8) × 10 3A for I +, in December of 1968 and 218 ± 19 km for w, 187 ± 20 A km −1 for J 0, and (45 ± 3) × 10 3 A for I +, in June of 1969, respectively. We therefore present a diurnal study covering the entire Earth, in which for the first time, morning data earlier than 1000 LT are incorporated in the analysis. This has enabled us to chart a clearer picture of the temporal variations of electrojet parameters at two different solstices. This shows that all of the three parameters vary substantially with local time, in such a manner that J 0 and I + attain maximal values around local noon, while w is a minimum then, and therefore confirms the finding of Agu and Onwumechili.
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