Galactic dynamo and helicity losses through fountain flow

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dc.creatorShukurov, Anvar
dc.creatorSokoloff, Dmitry
dc.creatorSubramanian, Kandaswamy
dc.creatorBrandenburg, Axel
dc.date2005-12-23
dc.date2006-01-19
dc.date.accessioned2026-07-07T06:49:13Z
dc.date.available2026-07-07T06:49:13Z
dc.descriptionNonlinear behaviour of galactic dynamos is studied, allowing for magnetic helicity removal by the galactic fountain flow. A suitable advection speed is estimated, and a one-dimensional mean-field dynamo model with dynamic alpha-effect is explored. 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.
dc.description4 pages, 2 figures, accepted by A&A Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/0512592
dc.identifierhttp://arxiv.org/abs/astro-ph/0512592
dc.identifierAstron.Astrophys. 448 (2006) L33-L36
dc.identifierdoi:10.1051/0004-6361:200600011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104259
dc.subjectAstrophysics
dc.titleGalactic dynamo and helicity losses through fountain flow
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