Mathematics – Logic
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasau..11..164m&link_type=abstract
Astronomical Society of Australia, Proceedings, vol. 11, no. 2, p. 164-169
Mathematics
Logic
Magnetic Flux, Solar Cycles, Sunspots, Time Series Analysis, Annual Variations, Chronology, Power Spectra, Radiant Flux Density, Regression Analysis
Scientific paper
Four tree ring-index site chronologies, representing standardized annual growth rates for spruce trees growing at high altitude sites in Colorado, have been employed as proxy data in a regression model for the annual variation of solar radio flux at 2800 MHz (F10 x 7) and the Catania sunspot area (AC). These dendrochronological time series all exhibit significant power spectrum peaks at about 11 years and separately correlate with the annual values of Rz, F10 x 7 and AC, as solar activity indicators. The two models constructed give the cyclic variation of F10 x 7 and AC back to AD1673.
Murphy John O.
Sampson H.
Veblen Thomas T.
Villalba Ricardo
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