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Enhanced dynamo growth in nonhomogeneous conducting fluids

Abstract : We address magnetic-field generation by dynamo action in systems with inhomogeneous electrical conductivity and magnetic permeability. More specifically, we first show that the Taylor-Couette kinematic dynamo undergoes a drastic reduction of its stability threshold when a (zero-mean) modulation of the fluid's electrical conductivity or magnetic permeability is introduced. These results are obtained outside the mean-field regime, for which this effect was initially proposed. Beyond this illustrative example, we extend a duality argument put forward by Favier & Proctor (2013) to show that swapping the distributions of conductivity and permeability and changing u → −u leaves the dynamo threshold unchanged. This allows one to make connections between a priori unrelated dynamo studies. Finally, we discuss the possibility of observing such an effect both in laboratory and astrophysical settings.
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https://hal.archives-ouvertes.fr/hal-03526715
Contributor : Florence Marcotte Connect in order to contact the contributor
Submitted on : Friday, January 14, 2022 - 4:36:39 PM
Last modification on : Sunday, May 1, 2022 - 3:17:46 AM
Long-term archiving on: : Friday, April 15, 2022 - 7:12:12 PM

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Florence Marcotte, Basile Gallet, François Pétrélis, Christophe Gissinger. Enhanced dynamo growth in nonhomogeneous conducting fluids. Physical Review E , American Physical Society (APS), 2021, ⟨10.1103/PhysRevE.104.015110⟩. ⟨hal-03526715⟩

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