Wave interference from beats between nearly degenerate MRI eigenfrequencies drives cyclic large-scale dynamos in unstratified accretion disks via an oscillating shear-current effect, predicting a period of ~30(1+a²)^{1/2} orbital times.
The magnetorotational instability as a jet launching mechanism
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abstract
Magnetorotational turbulence and magnetically driven disc winds are often considered as separate processes. However, realistic astrophysical discs are expected to be subject to both effects, although possibly at different times and locations. We investigate here the potential link between these two phenomena using a mixed numerical and analytical approach. We show in particular that large-scale MRI modes which dominate strongly magnetised discs (plasma beta~10) naturally produce magnetically driven outflows in the nonlinear regime. We show that these outflows share many similarities with local and global disc wind solutions found in the literature. We also investigate the 3D stability of these outflows and show that they are unstable on dynamical timescales. The implications of these results for the transition between a jet-emitting disc and a standard "viscous" disc are discussed.
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Plane-parallel analysis finds MRI operates in solids only when magnetic tension exceeds shear modulus, requiring spin frequencies ≳300 Hz for crust amplification in neutron-star mergers.
citing papers explorer
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Wave interference as the origin of the cyclic magnetorotational dynamo in accretion disks: insights from weakly nonlinear theory and local shearing box simulations
Wave interference from beats between nearly degenerate MRI eigenfrequencies drives cyclic large-scale dynamos in unstratified accretion disks via an oscillating shear-current effect, predicting a period of ~30(1+a²)^{1/2} orbital times.
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Magneto-rotational instabilities in solids: application to neutron-star crusts
Plane-parallel analysis finds MRI operates in solids only when magnetic tension exceeds shear modulus, requiring spin frequencies ≳300 Hz for crust amplification in neutron-star mergers.