Intermittency in the homopolar dynamo - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2005

Intermittency in the homopolar dynamo

Résumé

We study a modified Bullard dynamo and show that this system is equivalent to a nonlinear oscillator subject to a multiplicative noise. The stability analysis of this oscillator is performed. Two bifurcations are identified, first towards an ``intermittent'' state where the absorbing (non-dynamo) state is no more stable but the most probable value of the amplitude of the oscillator is still zero and secondly towards a ``turbulent'' (dynamo) state where it is possible to define unambiguously a (non-zero) most probable value around which the amplitude of the oscillator fluctuates. The bifurcation diagram of this system exhibits three regions which are analytically characterized.
Fichier principal
Vignette du fichier
publi.pdf (152.99 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00124934 , version 1 (16-01-2007)

Identifiants

  • HAL Id : hal-00124934 , version 1

Citer

Nicolas Leprovost, Bérengère Dubrulle, Franck Plunian. Intermittency in the homopolar dynamo. Fundamental and Applied MHD, 2005, Riga, France. pp.105-108. ⟨hal-00124934⟩
238 Consultations
47 Téléchargements

Partager

Gmail Facebook X LinkedIn More