Abstract
POGO satellite data are compared with the ground data at Ibadan. Results show poor correlation. The ratio Ground/POGO obtained from the scatter diagrams and extrapolated to the value on the jet axis is compared with other ratios from India, Addis Ababa and Huancayo. The variation in the ratios from different zones is discussed in the light of the results of the preliminary work on the upper mantle conductivity structure in Nigeria. It is concluded that the conventional model of image plane approximation used by Chapman and others in deducing the induction part of the electrojet is unrealistic in the face of recent results of Solid Earth Physics study.
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