Abstract
Summary. The daily variation for the mean of the eight most quiet days of the IGY is represented as a function of latitude, longitude and UT by ~ncaiis of a spherical harmonic model. The most appropriate choice ofS4 baseline is investigated, on the assumption that the external electric currents deduced from the model should be negligible at local midnight. The properties of tlic final model are discussed, particularly with regard to the external current foci, and are compared with those of previous models.
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