Abstract
II.
IN my last Lecture I alluded to the complicated periodicity which sun-spots exhibit. It is right here to quote the remark of Prof. Stokes, that until we have applied to solar phenomena a sufficiently rigid analysis we are not certain that this apparent periodicity will bear all the marks of a true periodicity. It cannot however be denied that solar phenomena are roughly periodical, and this apparent periodicity has influenced observers in their attempts to search for a cause. There have been two schools of speculators in this interesting region, consisting of those who imagine a cause within the sun, and of those who imagine one without. The former may be right, but apparently they cannot advance our knowledge much. We know very little of the interior of the sun, and no one has yet ventured on any hypothesis regarding the modus operandi by which these strangely complicated and roughly periodical surface phenomena may be supposed to be produced by the internal action of the sun itself.
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Solar Physics—Connexion between Solar and Terrestrial Phenomena 1 . Nature 24, 150–153 (1881). https://doi.org/10.1038/024150a0
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DOI: https://doi.org/10.1038/024150a0