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Название: Helicity is Unnecessary for Alpha Effect Dynamos, But it Helps
Авторы: Gilbert A.D., Frisch U., Poucuet A.
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.