Abstract
SINCE the year 1871 the Italian astronomer, Prof. Tacchini, has been daily making spectroscopic observations of the sun, noting the number, size and position of the prominences visible on the solar limb. A preliminary?study of this very valuable homogeneous series of data rendered it possible to demonstrate that the variation of the frequency of occurrence of these phenomena followed a very general law, the number waxing and waning at intervals of about eleven years, and synchronising with the variation of the number of spots on the sun's disc. This result was pointed out some time ago in the pages of this Journal (vol. lxvi. p. 248), oand it was there further stated that there were in addition subsidiary maxima and minima superimposed on the main eleven-jear curve.
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LOCKYER, W. Solar Prominences and Terrestrial Magnetism . Nature 67, 377–379 (1903). https://doi.org/10.1038/067377a0
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DOI: https://doi.org/10.1038/067377a0