Solar radius variations over the past 265 years

Details Solar radius variations over the past 265 years Solar radius variations over the past 265 years

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248.1144g&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1144-1155.

Astronomy and Astrophysics

Astrophysics

78

Radii, Secular Variations, Solar Magnetic Field, Sunspot Cycle, Variable Stars, Astrometry, Periodic Variations, Solar Activity Effects

Scientific paper

The presence of a 76-year solar radius modulation is consistently suggested by an analysis of five different data sets, including meridian circle observations, timings of Mercury transits, and total solar eclipse durations. The 76-year radius variation, whose last maximum occurred in 1911, has a half-amplitude of variation of about 0.2 arsec and is negatively correlated with the Gleissberg cycle of the mean sunspot numbers at the 2-Omega level of significance. Although a more significant, 3-Omega correlation is found between the solar radius and the sunspot cycle at 11 years, the correlation is again negative, with maximum sunspot number corresponding to minimum solar radius. A secular decrease of about 0.1 arcsec per century over the last 265 years is also likely from an objective analysis of available data.

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