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A study of the occurrence frequency of equatorial Es (Esq) and daytime blanketing Es at Ibadan (dip 6°S) and Zaria (dip 3°N) in Nigeria is presented. The period of study covers the years 1958 to 1965. Experimental results from the study reveal that Esq and blanketing Es are different phenomena and that a high incidence of Esq is usually accompanied by a low incidence of blanketing Es, and vice versa. In addition, the extent of the Esq belt in Nigeria is deduced from the relative occurrence of Esq and nonequatorial Es during the daytime at Ibadan.

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