Axisymmetric dynamo action is possible with anisotropic conductivity - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Research Année : 2020

Axisymmetric dynamo action is possible with anisotropic conductivity

Résumé

A milestone of dynamo theory is Cowling's theorem, known in its modern form as the impossibility for an axisymmetric velocity field to generate an axisymmetric magnetic field by dynamo action. Using an anisotropic electrical conductivity we show that an axisymmetric dynamo is in fact possible with a motion as simple as solid body rotation. On top of that the instability analysis can be conducted entirely analytically, leading to an explicit expression of the dynamo threshold which is the only example in dynamo theory.
Fichier principal
Vignette du fichier
PhysRevResearch.2.013321.pdf (948.42 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03086303 , version 1 (01-09-2023)

Identifiants

Citer

Franck Plunian, Thierry Alboussière. Axisymmetric dynamo action is possible with anisotropic conductivity. Physical Review Research, 2020, 2 (1), ⟨10.1103/PhysRevResearch.2.013321⟩. ⟨hal-03086303⟩
36 Consultations
5 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More