Solar-radius variations from transits of Mercury across the solar disk

Autor:	M. L. Sveshnikov
Rok vydání:	2002
Předmět:	Physics Amplitude chemistry Space and Planetary Science Astronomy chemistry.chemical_element Astronomy and Astrophysics Solar radius Positive correlation Solar disk Sign (mathematics) Mercury (element)
Zdroj:	Astronomy Letters. 28:115-120
ISSN:	1562-6873 1063-7737
DOI:	10.1134/1.1448847
Popis:	We analyze the internal contact timings for transits of Mercury across the solar disk during 1631–1973. The revealed secular decrease in the solar radius, \(0\mathop .\limits^{''} 06 \pm 0\mathop .\limits^{''} 03\), is attributed to systematic observational errors. We have found 80-and 11-year cycles in the solar-radius variations. The amplitudes of the 80-and 11-year cycles are \(0\mathop .\limits^{''} 24 \pm 0\mathop .\limits^{''} 05\) and \(0\mathop .\limits^{''} 08 \pm 0\mathop .\limits^{''} 02\), respectively. There is a positive correlation between the solar-radius and sunspot-number variations. This result is shown to be in conflict with the results of Laclare et al. (1996) for the sign of correlation. The possible error sources are discussed.
Databáze:	OpenAIRE
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