Abstract
LARGE secular variations have been found in short-lived sunspots as recorded in “Sunspots seen on one Day Only” of the Greenwich Photo-Heliographic Results, 1879–1957. The 11-yr. period often appears like a subsidiary perturbation.
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References
Ringnes, T. S., and Jensen, E., Astrophysica Norvegica, 7, 99 (1960).
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RINGNES, T. Secular Variations of Short-lived Sunspots. Nature 192, 151–152 (1961). https://doi.org/10.1038/192151b0
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DOI: https://doi.org/10.1038/192151b0
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