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Astron. Astrophys. 321, 323-329 (1997)

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Solar dynamics over cycle 19 using sunspots as tracers

E. Nesme-Ribes * 1, N. Meunier 1 and I. Vince 2

1 URA 2080 CNRS, Département d'Astronomie Solaire et Planétaire, Observatoire de Paris, 5 Place Janssen, F-92195 Meudon, France
2 Astronomical Observatory, Volgina 7, YU 11050 Beograd, Yugoslavia

Received 17 May 1996 / Accepted 1 October 1996

Abstract

The angular velocities and meridional motions of cycle 19 sunspots observed at Meudon were investigated. We compare our results with cycle 21 sunspot rotation properties (Nesme-Ribes et al. 1993a). We found also a complex latitudinal meridional circulation pattern similar to what was observed on cycle 21 sunspots (Nesme-Ribes et al. 1993b). We also corroborated the very small sunspot covariance (i.e. angular momentum transport via Reynolds stresses), which imposes a strong constraint on the source term of the differential rotation modeling.

Key words: sunspots – Sun: rotation – Sun: magnetic fields – Sun: activity

* Deceased on November the 25th, 1996

Send offprint requests to: N. Meunier

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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