Dynamo Onset as a First-Order Transition: Lessons from a Shell Model for Magnetohydrodynamics

Ganapati Sahoo, Dhrubaditya Mitra, Rahul Pandit

We carry out systematic and high-resolution studies of dynamo action in a shell model for magnetohydrodynamic (MHD) turbulence over wide ranges of the magnetic Prandtl number $Pr_{…