THE FAST GALACTIC DYNAMO
The α-effect and the coefficient of eddy diffusivity are calculated for the magnetic field in a random flow with recovery. Such a flow loses its memory abruptly at random times that form a Poisson flow of events. Interstellar turbulence sustained by supernova outbursts is one of the physical realizations of such a flow. The growth rates and configurations of large-scale galactic magnetic fields for this situation are close to those predicted by simple galactic dynamo models. At the same time, the model of a flow with recovery makes it possible to trace the role of the effective "forgetting" of correlations. The presence of this forgetting distinguishes interstellar turbulence from other types of random flows.
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Document Type: Research Article
Affiliations: Subdivision of Probability Theory, Department of Mechanics and Mathematics, Moscow State University, Moscow, 119899, Russia
Publication date: 2003-02-01