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The galactic dynamo: Axisymmetric and non-axisymmetric modes |
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| Authors: | Yulia Krasheninnikova Alexander Ruzmaikin Dmitry Sokoloff Anvar Shukurov |
| Institution: | 1. Space Research Institute, Academy of Sciences , Moscow, USSR;2. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Academy of Sciences , Moscow Region, USSR;3. Physics Department , Moscow State University , Moscow, USSR |
| Abstract: | Abstract We discuss recent developments in the theory of large-scale magnetic structures in spiral galaxies. In addition to a review of galactic dynamo models developed for axisymmetric disks of variable thickness, we consider the possibility of dominance of non-axisymmetric magnetic modes in disks with weak deviations from axial symmetry. Difficulties of straightforward numerical simulation of galactic dynamos are discussed and asymptotic solutions of the dynamo equations relevant for galactic conditions are considered. Theoretical results are compared with observational data. |
| Keywords: | Galactic magnetic fields dynamo theory |