2006 (IPP)

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Author: search.filters.author.Sokoloff, DmitrySubject: search.filters.subject.Turbulence

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    Galactic dynamo and helicity losses through fountain flow
    (2006-01-19) Shukurov, A.; Sokoloff, Dmitry; Subramanian, Kandaswamy
    Nonlinear behaviour of galactic dynamos is studied, allowing for magnetic helicity removal by the galactic fountain flow. Methods. A suitable advection speed is estimated, and a one-dimensional mean-field dynamo model with dynamic α-effect is explored. Results. It is shown that the galactic fountain flow is efficient in removing magnetic helicity from galactic discs. This alleviates the constraint on the galactic mean-field dynamo resulting from magnetic helicity conservation and thereby allows the mean magnetic field to saturate at a strength comparable to equipartition with the turbulent kinetic energy.