Kinematic generation of electrically conductive fluid by space-periodic flow is considered. The generated magnetic modes have a form of a product of three-dimensional field having the same spatial periodicity and a Fourier harmonic whose wave vector q is an arbitrary constant. We present the examples of computation of the modes associated with the maximum (over q ) growth rates for a generic flow velocity where the magnetic α-effect is present and for a parity-invariant flow lacking the α-effect and featuring negative magnetic eddy diffusivity. It is shown that magnetic modes associated with the maximum over q growth rates are characterized by weak separation of spatial scales, and, therefore, neither of the two noted effects can be regarded as the main mechanism responsible for their generation.

中文翻译：

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关于Bloch型磁模的运动学生成

考虑通过空间周期流动产生导电流体的运动学。产生的磁模式具有相同空间周期性的三维场与波矢量q为任意常数的傅立叶谐波的乘积形式。我们给出了与最大（超过 q ）增长率相关的模式计算示例，其中存在磁α效应的通用流速和缺乏α效应且具有负磁涡扩散率的奇偶不变流. 结果表明，与最大超过 q 增长率相关的磁模式的特征是空间尺度的弱分离，因此，这两种效应都不能被视为产生它们的主要机制。