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• W2134574652 abstract "Blackman and Brandenburg argued that magnetic helicity conservation in dynamo theory can in principle be captured by diagrams of mean field dynamos when the magnetic fields are represented by ribbons or tubes, but not by lines. Here, we present such a schematic ribbon diagram for the α2 dynamo that tracks magnetic helicity and provides distinct scales of large-scale magnetic helicity, small-scale magnetic helicity, and kinetic helicity involved in the process. This also motivates our construction of a new ‘2.5 scale’ minimalist generalization of the helicity-evolving equations for the α2 dynamo that separately allows for these three distinct length-scales while keeping only two dynamical equations. We solve these equations and, as in previous studies, find that the large-scale field first grows at a rate independent of the magnetic Reynolds number RM before quenching to an RM-dependent regime. But we also show that the larger the ratio of the wavenumber where the small-scale current helicity resides to that of the forcing scale, the earlier the non-linear dynamo quenching occurs, and the weaker the large-scale field is at the turnoff from linear growth. The harmony between the theory and the schematic diagram exemplifies a general lesson that magnetic fields in magnetohydrodynamic are better visualized as two-dimensional ribbons (or pairs of lines) rather than single lines." @default.
• W2134574652 created "2016-06-24" @default.
• W2134574652 creator A5040531959 @default.
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• W2134574652 date "2014-06-10" @default.
• W2134574652 modified "2023-09-27" @default.
• W2134574652 title "Ribbons characterize magnetohydrodynamic magnetic fields better than lines: a lesson from dynamo theory" @default.
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• W2134574652 doi "https://doi.org/10.1093/mnras/stu939" @default.
• W2134574652 hasPublicationYear "2014" @default.
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