Stochastic Dynamics of Field Generation in Conducting Fluids

Details Stochastic Dynamics of Field Generation in Conducting Fluids Stochastic Dynamics of Field Generation in Conducting Fluids

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522.1088f&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 2, pp. 1088-1099.

Astronomy and Astrophysics

Astronomy

7

Hydrodynamics, Ism: Magnetic Fields, Magnetohydrodynamics: Mhd, Sun: Magnetic Fields

Scientific paper

The large-scale magnetic fields of stellar and galactic bodies are generally understood to be organized and amplified by motions in the conducting fluid media of these bodies. This article examines a mechanism by which continual excitation of the conducting fluid by small-scale fields results in production of large-scale fields. The excitation of the induction equation by small-scale fields is parameterized as stochastic forcing, and the crucial role of the nonnormality of the induction operator in determining the spatial and temporal structure of variation in the large-scale fields is emphasized. A cylindrically symmetric helical flow is used to provide illustrative examples.

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