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Astron. Astrophys. 319, 673-682 (1997)

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Cycle 19 facula dynamics

I. Angular rotation

N. Meunier , E. Nesme-Ribes and N. Grosso

URA 2080 CNRS, Département d'Astronomie Solaire et Planétaire, Observatoire de Paris, 5 Place Janssen, F-92195 Meudon, France

Received 20 May 1996 / Accepted 14 August 1996


Our analysis of photospheric facula rotation throughout cycle 19 has yielded a number of new findings: (1) The existence of a strong north-south asymmetry of the rotation rates (of as much as [FORMULA] day), related to the magnetic activity level. (2) The presence of two distinct populations that possibly reflect the complexity of dynamo waves at the interface between the convective zone and the radiative zone. (3) A pattern of slow/fast rotation zones similar to the magnetic torsional oscillation discovered by Snodgrass (1991). Facula rotation showed little time-dependence throughout solar cycle.

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

Send offprint requests to: N. Meunier

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998