What is a stellar dynamo?

Details What is a stellar dynamo? What is a stellar dynamo?

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..479c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 1, 1991, p. 479-484.

Astronomy and Astrophysics

Astronomy

15

Dynamo Theory, Late Stars, Lorentz Force, Stellar Magnetic Fields, Magnetoactivity, Turbulent Diffusion, Two Dimensional Models, Velocity Distribution

Scientific paper

Numerical simulations of turbulent stellar dynamos are now feasible. The characteristic time-scale for kinematic behavior is related to the turnover time of the turbulent eddies. Results from idealized 2D models show that the Lorentz force alters the velocity field, allowing transient magnetic activity to persist for intervals much longer than the expected turbulent decay time. For 3D flows a characteristic time Te is defined for turbulent diffusion to act, based on the rate at which magnetic energy is dissipated, and it is asserted that there is a dynamo only if the field survives for times much longer than Te. This criterion is then applied to cyclic magnetic activity in late-type stars.

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