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Lookup NU author(s): Professor Anvar Shukurov,
Professor Dmitry Sokoloff,
Professor Axel Brandenburg
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Aims. 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. © ESO 2006.
Author(s): Shukurov A, Sokoloff D, Subramanian K, Brandenburg A
Publication type: Article
Publication status: Published
Journal: Astronomy and Astrophysics
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
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