The motion of magnetic fronts in spiral galaxies |
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| Authors: | D Moss A Petrov D Sokoloff |
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| Institution: | 1. Mathematics Department , Manchester University , Manchester, M13 9PL, UK;2. The People's Friendship University , Ordzonikidze, 3, Moscow, 117923, Russia;3. Department of Physics , Moscow State University , Moscow, 117588, Russia |
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| Abstract: | Abstract We study the nonlinear asymptotic thin disc approximation to the mean field dynamo equations, as applicable to spiral galaxies. The circumstances in which sharp magnetic field structures (fronts) can propagate radially are investigated, and an expression for the speed of propagation derived. We find that the speed of an interior front is proportional to η//R ? (where η is the diffusivity and Rt the galactic radius), whereas an exterior front moves with speed of order  | |
| Keywords: | Galactic dynamo sharp structures magnetic fronts seed field |
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