The magnetorotational instability (MRI) is potentially important for magnetic field amplification in core-collapse supernovae. Combining theoretical analysis and numerical simulations, we investigate whether magnetic fields can be increased to dynamically relevant strengths. We find that a secondary shear flow instability (Kelvin-Helmholtz) developing on top of MRI structures terminates the MRI driven amplification when the magnetic field strength has grown only by a factor of about twenty.     «

The magnetorotational instability (MRI) is potentially important for magnetic field amplification in core-collapse supernovae. Combining theoretical analysis and numerical simulations, we investigate whether magnetic fields can be increased to dynamically relevant strengths. We find that a secondary shear flow instability (Kelvin-Helmholtz) developing on top of MRI structures terminates the MRI driven amplification when the magnetic field strength has grown only by a factor of about twen...     »