Abstract
THE establishment of the observatory at Huancayo, Peru, near the magnetic equator, led to the discovery of daily magnetic variations, both solar and lunar, approximately twice as great as those previously found in other tropical regions. McNish1 has sought to explain this anomaly by qualitatively modifying the Balfour Stewart – Schuster 'dynamo' theory to allow for the non-coincidence of the earth's magnetic and geographic axes. According to McNish, enhanced magnetic variations should occur in the areas between the magnetic and geographic equators. On the other hand, Egedal2 and Chapman3 have recently put forward data from tropical regions which appear to show that the distribution of the phenomenon is more complex than could be explained by McNish's suggestion.
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MARTYN, D. Daily Magnetic Variations near the Equators. Nature 163, 685–686 (1949). https://doi.org/10.1038/163685a0
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DOI: https://doi.org/10.1038/163685a0
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