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Minimal seeds for subcritical dynamos (Invited speaker)

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DY2W01 - Dynamos in planets and stars - similarities and differences

I will show how optimal control of finite-amplitude disturbances over a freely evolving and possibly turbulent flow, can systematically identify subcritical dynamo solutions without requiring prior knowledge of the magnetic field amplification mechanisms. Following an approach developed in the context of subcritical transition to turbulence in shear flows, the method identifies both the structure and amplitude of critical perturbations (or “minimal dynamo seeds”). I will discuss some new implications for the modeling of astrophysical dynamos, in particular Keplerian discs dynamos or the strong branch of the Geodynamo.

This talk is part of the Isaac Newton Institute Seminar Series series.

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