Abstract
It has been established by earlier workers that a narrow bond of strong current system called the electrojet existing at E-region heights near the equator is responsible for the equatorial sporadic- E. Since the electrojet shows a remarkable correlation with sunspot activity, it is to be expected that equatorial E s should also show a similar variation. A systematic study of the year to year variation in the critical frequencies of sporadic- E for the three equatorial stations belonging to three different longitude zones has been made in this investigation. It is observed that for some stations the maximum occurs about one year before sunspot maximum whereas for others it occurs 1 year after the sunspot maximum. An attempt has been made to explain these anomalies and some other peculiarities noted in this investigation.
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