Abstract
PERHAPS no result in magnetism has excited so much interest as that which has connected the varying diurnal oscillation of the magnetic needle, and the frequency of the aurora polaris, with the spotted area of the sun's surface, in a common cycle of ten and a half years. Various investigations have been undertaken in order to determine whether other phenomena could not be found which would take a place in this chain.
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BROUN, J. The Sun's Magnetic Action at the Present Time. Nature 17, 183–184 (1878). https://doi.org/10.1038/017183e0
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DOI: https://doi.org/10.1038/017183e0