The Fast Dynamo in Interstellar Turbulence

Details The Fast Dynamo in Interstellar Turbulence The Fast Dynamo in Interstellar Turbulence

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45...95l&link_type=abstract

Astronomy Reports, Volume 45, Issue 2, February 2001, pp.95-99

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The α effect and 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 physical realization 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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