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Solar diameter and solar rotation during the Maunder minimum

Published online by Cambridge University Press:  03 August 2017

E. Ribes ,
J.C. Ribes  and
R. Barthalot
E. Ribes
Affiliation:
Observatoire de Paris, Section d'Astrophysique de Meudon, 92 195 Meudon principal cedex, France Observatoire de St. Genis Laval, Université de Lyon 1, 89 230 Saint Genis Laval, France
J.C. Ribes
Affiliation:
Observatoire de Paris, Section d'Astrophysique de Meudon, 92 195 Meudon principal cedex, France Observatoire de St. Genis Laval, Université de Lyon 1, 89 230 Saint Genis Laval, France
R. Barthalot
Affiliation:
Observatoire de Paris, Section d'Astrophysique de Meudon, 92 195 Meudon principal cedex, France Observatoire de St. Genis Laval, Université de Lyon 1, 89 230 Saint Genis Laval, France

Abstract

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The Paris observatory is in possession of a 53 y record of solar diameters and sunspot positions during the Maunder minimum (1666–1719). For the period (1666 to 1684), the solar diameter was 32′9″ and slowly decreased down to 32′6″ when sunspot activity had resumed. Nowadays, the solar diameter is 32′2″ when taking into account of the solar irradiance. During the same period, the sunspot rotation was smaller than the present one (3% less near the equator), and the differential rotation was greater.

The two phenomena (a larger Sun and a slower rotation) suggest that the Sun undergoes a cyclic expansion and contraction, on timescale of several centuries.

Type
Chapter 3: Longterm Variations in the Sun
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 227 - 230
Copyright
Copyright © Reidel 1988 

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