Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..615s&link_type=abstract
Nature (ISSN 0028-0836), vol. 322, Aug. 14, 1986, p. 615-617. NSF-supported research.
Physics
4
Secular Variations, Sediments, Solar Activity Effects, Solar Terrestrial Interactions, Sunspots, Climatology, Dynamo Theory, Precambrian Period, Solar Cycles, Stellar Luminosity, Time Dependence
Scientific paper
The Hale solar period, τH(1) ≅ 22 yr, and its second harmonic, τH(2) ≅ 11 yr, which characterize the sunspot index, are imprinted in certain varved rocks of Archaean to late Precambrian age, but the varves record climate and thus are sensitive to solar insolation. The authors report apparent collective behaviour of the two kinds of data. The 22-yr/11-yr amplitude spectral density ratio, βi of the sunspot index (which is a measure of solar-cycle asymmetry), plotted together with βis from three ancient varve thickness sequences against the age for each βi, results in a remarkably close fit to a decreasing exponential with time constant τ ≅ 2 Gyr. These varves and the sunspot index appear to link solar luminosity and the solar field, implying that a common forcing mechanism affects luminosity and the dynamo periods through the common decay time, τ.
Sonett Charles P.
Trebisky T. J.
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