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We show that non-axisymmetric, non-helical perturbations in an unstratifiedshear flow produce a shear-plane averaged electromotive force (EMF)proportional to a spatially dependent kinetic helicity. This new "shear-driven$\alpha$-effect" can amplify shear-plane averaged magnetic fields, but isundiscoverable when invoking the homogeneity assumption for dynamocoefficients. It is a candidate mechanism underlying large scale fieldgeneration in astrophysical, laboratory, and simulated shear flows, andhighlights the essentiality of correctly averaging dynamo coefficients andfields.

Minimalist large scale dynamo from shear-driven inhomogeneity