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Title:
Solar radius variations over the past 265 years
Authors:
Gilliland, R. L.
Affiliation:
AA(High Altitude Observatory; National Center for Atmospheric Research, Boulder, CO)
Publication:
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1144-1155. (ApJ Homepage)
Publication Date:
09/1981
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Radii, Secular Variations, Solar Magnetic Field, Sunspot Cycle, Variable Stars, Astrometry, Periodic Variations, Solar Activity Effects
DOI:
10.1086/159243
Bibliographic Code:
1981ApJ...248.1144G

Abstract

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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