Abstract
THE aurora in the Unites States is rarely seen at a single station for two nights in succession, but is usually reported from different stations for about four days at each manifestation. Recurrence at intervals of nearly twenty-six days is common. During 1888 there were eighteen instances of this, in which the beginnings of the attendant magnetic perturbations, as shown by the self-recording magnetograph, were so abrupt that it was possible by this means to determine the time of the revolution of the sun, the average period thus found being twenty-six days and eight hours.
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VEEDER, M. The Aurora. Nature 40, 318–319 (1889). https://doi.org/10.1038/040318c0
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DOI: https://doi.org/10.1038/040318c0
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