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Comptes Rendus Physique
Volume 9, n° 7
pages 757-765 (septembre 2008)
Doi : 10.1016/j.crhy.2008.07.008
The solar dynamo
La dynamo solaire
 

Michel Rieutord
Laboratoire dʼastrophysique de Toulouse-Tarbes, CNRS et Université de Toulouse, 14, avenue E. Belin, 31400 Toulouse, France 

Abstract

We shortly review the basic observational facts concerning the solar dynamo. Then, a brief overview of our current understanding of the large-scale evolution of the magnetic field of the Sun is proposed, showing, in particular, some successes and difficulties of the mean-field models. We illustrate the complications of this problem with recent work on stellar dynamos. We also compare the solar situation to that of the core of the Earth as well as those of laboratory and numerical experiments. To cite this article: M. Rieutord, C. R. Physique 9 (2008).

The full text of this article is available in PDF format.
Résumé

Nous passons brièvement en revue les principaux faits observationnels concernant la dynamo solaire. Nous exposons ensuite notre compréhension actuelle de la génération du champ magnétique solaire aux grandes échelles en montrant en particulier les succès obtenus par les théories de champ moyen, mais aussi les difficultés qui surgissent quand tous les aspects du problème sont pris en compte. Nous illustrons ces complications par les récentes observations de lʼactivité magnétique dʼétoiles semblables au soleil, lesquelles montrent la grande sensibilité de certaines caractéristiques des dynamos stellaires aux paramètres des étoiles. Enfin, nous comparons la situation solaire à celle du noyau terrestre, des expériences de laboratoire et des expériences numériques actuellement possibles. Pour citer cet article : M. Rieutord, C. R. Physique 9 (2008).

The full text of this article is available in PDF format.

Keywords : Sun, Dynamo, Turbulence

Mots-clés : Soleil, Dynamo, Turbulence




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