http://arxiv.org/abs/1902.04737
We show that non-axisymmetric, non-helical perturbations in an unstratified shear flow produce a shear-plane averaged electromotive force (EMF) rigorously proportional to a spatially dependent kinetic helicity. This new “shear-driven $\alpha$-effect” can amplify even initially uniform magnetic fields, and is undiscoverable in approaches invoking homogeneity of dynamo coefficients. Distinct from previous large scale dynamo mechanisms, it too should be considered when interpreting large scale field generation in astrophysical, laboratory, and simulated shear flows.
F. Ebrahimi and E. Blackman
Thu, 14 Feb 19
24/52
Comments: 4 pages
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