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Galactic dynamo and helicity losses through fountain flow

Lookup NU author(s): Professor Anvar ShukurovORCiD, Professor Dmitry Sokoloff, Kumanan Subramaniam, Professor Axel Brandenburg

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Abstract

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.

Publication metadata

Author(s): Shukurov A, Sokoloff D, Subramanian K, Brandenburg A

Publication type: Article

Publication status: Published

Journal: Astronomy and Astrophysics

Year: 2006

Volume: 448

Issue: 2

Pages: L33-L36

ISSN (print): 0004-6361

ISSN (electronic): 1432-0746

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1051/0004-6361:200600011

DOI: 10.1051/0004-6361:200600011

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