What question did this study set out to answer?

To investigate the dynamical stability of differentially rotating, gaseous astrophysical accretion disks in the presence of weak magnetic fields.

July 1, 1991The Astrophysical Journal

A powerful local shear instability in weakly magnetized disks. I - Linear analysis. II - Nonlinear evolution

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To investigate the dynamical stability of differentially rotating, gaseous astrophysical accretion disks in the presence of weak magnetic fields.
Formulated a linear stability analysis to evaluate axisymmetric disturbances in weakly magnetized, differentially rotating gaseous disks.
Modeled nonlinear evolution to derive scaling relations between perturbation wavenumber and Alfvén velocity.
Demonstrated a local dynamical shear instability with a maximum growth rate on the order of the angular rotation velocity, independent of magnetic field strength.
Showed that fluid motions driven by the instability directly generate both poloidal and toroidal magnetic field components.
Confirmed the scaling relation between the instability's wavenumber and the Alfvén velocity during nonlinear evolution.

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Implication

Theoretical analysis reveals powerful shear instability in weakly magnetized accretion disks, highlighting a fundamental mechanism driving turbulence in differentially rotating gas.

Cite This Study

Balbus et al. (1991) studied this question.

synapsesocial.com/papers/69daa4010d540cafc5839950 https://doi.org/10.1086/170270

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Implication

Theoretical analysis reveals powerful shear instability in weakly magnetized accretion disks, highlighting a fundamental mechanism driving turbulence in differentially rotating gas.

A powerful local shear instability in weakly magnetized disks. I - Linear analysis. II - Nonlinear evolution

Key Points

Discussion

Implication

Cite This Study

A powerful local shear instability in weakly magnetized disks. I - Linear analysis. II - Nonlinear evolution

Key Points

Discussion

Implication

Cite This Study

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