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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5237

Authors: Consolini, G.*
Tozzi, R.*
De Michelis, P.*
Title: Complexity in the sunspot cycle
Title of journal: Astronomy & Astrophysics
Series/Report no.: / 506 (2009)
Publisher: EDP Sciences
Issue Date: 3-Nov-2009
DOI: 10.1051/0004-6361/200811074
Keywords: Sun: activity
Sun: sunspots
methods: statistical
chaos
Abstract: The occurrence of complexity in the solar cycle, as monitored by the sunspot area butterfly diagram, is investigated by means of the natural orthogonal composition (NOC) technique and information theory approach. Although the butterfly diagram may be reconstructed using only two modes as already found in other papers for the Hale cycle, on deeper investigation it is possible to notice that the high variability, complexity, and stochasticity observed during the solar cycle are missing. A full description of the complex evolution of the solar cycle requires at least 30 modes. We show that these modes identify two different dynamical regimes, whose existence is also confirmed by the analysis of the Lyapunov exponents of the associated principal components. We suggest that the existence of these two physical dynamical regimes is at the origin of the dynamical complexity of the solar cycle. We attempt a discussion of these dynamical regimes also in terms of a nearly stable dynamo process described by the first two modes and a local superficial turbulent dynamo responsible for the more stochastic features observed in the solar cycle.
Appears in Collections:01.03.05. Solar variability and solar wind
05.07.99. General or miscellaneous
Papers Published / Papers in press

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