Abstract
A complete change of the character of the solar‐diurnal variations of vertical magnetic intensity observed at the Huancayo Magnetic Observatory during the past sunspot‐cycle is described. Characteristics of the southern type of variation, present during the northern summer solstice during 1922, give place to a form of variation characteristic of the Northern Hemisphere in 1932. This change is associated with the secular change of the Earth's general magnetic field which consists partly of a southern shift of the magnetic equator in the region around Huancayo.Detailed features of this change are discussed and found to be qualitatively in agreement with expected changes. The large magnitude of the changes indicates that the solar‐diurnal variation is a complex function of the Earth's general field such as is called for by the atmospheric‐dynamo theory of Balfour Stewart. Statistical considerations lead to the conclusion that the reality of the change is established to an extraordinarily high degree of probability.
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