Helicity is unnecessary for alpha effect dynamos, but it helps
- 1 June 1988
- journal article
- research article
- Published by Taylor & Francis in Geophysical & Astrophysical Fluid Dynamics
- Vol. 42 (1-2) , 151-161
- https://doi.org/10.1080/03091928808208861
Abstract
We present a two-scale analysis showing that helicity is not required for an alpha effect and associated dynamo instability, and that lack of parity-invariance in the velocity field is sufficient. We give an example of a non-helical velocity field which supports alpha effect dynamo action and demonstrate this effect numerically.Keywords
This publication has 5 references indexed in Scilit:
- Diffusion of weak magnetic fields by isotropic turbulenceJournal of Fluid Mechanics, 1976
- Dynamo action of fluid motions with two-dimensional periodicityPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1972
- Spatially periodic dynamosPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1970
- Berechnung der mittleren Lorentz-Feldstärke für ein elektrisch leitendes Medium in turbulenter, durch Coriolis-Kräfte beeinflußter BewegungZeitschrift für Naturforschung A, 1966
- Hydromagnetic Dynamo Models.The Astrophysical Journal, 1955