剪切驱动不均匀性的最小化大尺度发电机
Minimalist large scale dynamo from shear-driven inhomogeneity
摘要：
我们表明，非轴对称，非螺旋扰动在非分层剪切流产生剪切平面平均电动势（EMF）成比例的空间相关的动力学螺旋度。这种新的“剪切驱动的$α$效应”可以放大剪切平面平均磁场，但当调用发电机系数的均匀性假设时是不可忽略的。这是一个候选机制，在天体物理学，实验室和模拟剪切流的大尺度场生成，并强调正确平均发电机系数和字段的重要性。
英文摘要：
We show that non-axisymmetric, non-helical perturbations in an unstratified shear flow produce a shear-plane averaged electromotive force (EMF) proportional to a spatially dependent kinetic helicity. This new "shear-driven $α$-effect" can amplify shear-plane averaged magnetic fields, but is undiscoverable when invoking the homogeneity assumption for dynamo coefficients. It is a candidate mechanism underlying large scale field generation in astrophysical, laboratory, and simulated shear flows, and highlights the essentiality of correctly averaging dynamo coefficients and fields.
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