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September 17, 2025Open Access

Strong and Weak Dynamo Regimes in Taylor-Couette Flows

Key Points

A nonlinear magnetic dynamo was discovered in Taylor-Couette flow at small magnetic Prandtl numbers.
The transition occurs between a weak state with large-scale modes and a strong turbulent state with small-scale modes.
Initial perturbation amplitude and domain aspect ratio significantly influence the dynamo's evolution.
These findings may illuminate dynamo processes in various astrophysical objects experiencing low magnetic Prandtl numbers.

Abstract

We reveal a nonlinear magnetic dynamo in a Taylor-Couette flow at small magnetic Prandtl numbers Pm≤1, which has been previously believed to exist only at higher Pm≳10 in this flow. The amplitude of initial perturbations, Pm, and domain aspect ratio play a key role in the onset and evolution of the dynamo. It exists in two main states: a weak state dominated by large-scale modes and a strong, turbulent state with higher amplitude dominated by small-scale modes. These findings can be important for dynamo processes in various astrophysical objects with small Pm.

Strong and Weak Dynamo Regimes in Taylor-Couette Flows

Key Points

Abstract

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