Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473l..59c&link_type=abstract
Astrophysical Journal Letters v.473, p.L59
Astronomy and Astrophysics
Astronomy
24
Magnetohydrodynamics: Mhd, Magnetic Fields, Sun: Interior, Sun: Magnetic Fields
Scientific paper
The generation of a mean magnetic field by the action of small-scale turbulent fluid motions, the alpha -effect, is a fundamental ingredient of mean-field dynamo theory. However, recent mathematical models and numerical experiments are providing increasingly strong support to the notion that at high magnetic Reynolds numbers, the alpha -effect is strongly impeded long before the mean magnetic field has reached energy equipartition with the driving fluid motions. Taken at face value, this raises serious doubt as to whether the solar magnetic field is produced by a turbulent hydromagnetic dynamo after all, since it is an observed fact that the Sun does possess a structured, large-scale mean magnetic field of strength comparable to equipartition. In this Letter we demonstrate that the class of mean-field turbulent hydromagnetic models known as interface dynamos can produce equipartition-strength mean magnetic fields even in the presence of strong alpha -quenching.
Charbonneau Patrick
MacGregor Keith B.
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