In-out intermittency in PDE and ODE models of axisymmetric mean-field dynamos

Details In-out intermittency in PDE and ODE models of axisymmetric mean-field dynamos In-out intermittency in PDE and ODE models of axisymmetric mean-field dynamos

1998-04-03

arxiv.org/abs/chao-dyn/9804007v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, submitted to Phys. Rev. Lett., also available at http://www.maths.qmw.ac.uk/~eoc

Scientific paper

Employing some recent results in dynamics of systems with invariant subspaces we find evidence in both truncated and full axisymmetric mean-field dynamo models of a recently discovered type of intermittency, referred to as in-out intermittency. This is a generalised form of on-off intermittency that can occur in systems that are not skew products. As far as we are aware this is the first time detailed evidence has been produced for the occurrence of a particular form of intermittency for such deterministic PDE models and their truncations. The specific signatures of this form of intermittency make it possible in principle to look for such behaviour in solar and stellar observations. Also in view of its generality, this type of intermittency is likely to occur in other physical models with invariant subspaces.

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