If the fluid is electrically-conducting then a mean electromotive force (EMF) results even without basic rotation and the magnetic diffusivity becomes a highly anisotropic tensor. It is checked whether in this case self-excitation of a large-scale magnetic field is possible (so-called W Γ Jdynamo) a
Nonhelical mean-field dynamos in a sheared turbulence
β Scribed by I. Rogachevskii; N. Kleeorin
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 128 KB
- Volume
- 329
- Category
- Article
- ISSN
- 0004-6337
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π SIMILAR VOLUMES
When scale separation in space or time is poor, the mean-field Ξ± effect and turbulent diffusivity have to be replaced by integral kernels by which the dependence of the mean electromotive force on the mean magnetic field becomes nonlocal. Earlier work in computing these kernels using the test-field
## Abstract A magnetic field which is contained in a turbulent, electrically conducting fluid is supposed to decay. The decay time of the mean energy of the fluctuating part of the magnetic field β in contrast with the energy of the mean field β is shown to be determined by the molecular magnetic d
## Abstract In meanβfield magnetohydrodynamics the mean electromotive force due to velocity and magneticβfield fluctuations plays a crucial role. In general it consists of two parts, one independent of and another one proportional to the mean magnetic field. The first part may be nonzero only in th