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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
Abstract
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]](img1.gif)
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
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