Abstract
Magnetic records obtained at the recently established magnetic observatory at Ibadan in equatorial Africa for the period November 1955 to June 1957 are analysed harmonically for solar variations. The results, given in the form of harmonic dials, show that the amplitude of H is very large (similar to that observed at Huancayo), and the amplitude of Z is larger by a factor of 3 than any previously reported. These results are explained as arising from the equatorial electrojet centred on the magnetic equator, which is about 2 1 2 ° N of Ibadan. The variation in D at Ibadan is small, but has its phase completely reversed between the June and December solstices. The D-variation shows no obvious effect of the electrojet.
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