Abstract
view Abstract Citations (103) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar radius variations over the past 265 years Gilliland, R. L. 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. Publication: The Astrophysical Journal Pub Date: September 1981 DOI: 10.1086/159243 Bibcode: 1981ApJ...248.1144G Keywords: Radii; Secular Variations; Solar Magnetic Field; Sunspot Cycle; Variable Stars; Astrometry; Periodic Variations; Solar Activity Effects; Solar Physics full text sources ADS |
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