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Magnetograms from Eights, Antarctica, were compared with those taken at three close-spaced stations bracketing the calculated conjugate point in Quebec, Canada, and with records from other nearby stations in the northern hemisphere. A very close association among all variations save the Sq was found for the two-month period studied. Detailed analysis of the storm of January 10, 1962, yielded the conclusion that the region of closest association may be localized to within a few tens of kilometers for such disturbances.
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G. M. Boyd (1963) studied this question.
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