Higher helicity invariants and solar dynamo |
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Authors: | D D Sokolov E A Illarionov P M Akhmet’ev |
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Institution: | 1.Moscow State University,Moscow,Russia;2.Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation,Russian Academy of Sciences,Troitsk, Moscow,Russia |
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Abstract: | Modern models of nonlinear dynamo saturation in celestial bodies (specifically, on the Sun) are largely based on the consideration of the balance of magnetic helicity. This physical variable has also a topological meaning: it is associated with the linking coefficient of magnetic tubes. In addition to magnetic helicity, magnetohydrodynamics has a number of topological integrals of motion (the so-called higher helicity moments). We have compared these invariants with magnetic helicity properties and concluded that they can hardly serve as nonlinear constraints on dynamo action. |
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