Grand Minima Under the Light of a Low Order Dynamo Model
arXiv:0908.0496 · doi:10.1016/j.jastp.2009.12.019
Abstract
In this work we use a low order dynamo model and study under which conditions can it reproduce solar grand minima. We begin by building the phase space of a proxy for the toroidal component of the solar magnetic field and we develop a model, derived from mean field dynamo theory, that gives the time evolution of the toroidal field. This model is characterized by a non-linear oscillator whose coefficients retain most of the physics behind dynamo theory. In the derivation of the model we also include stochastic oscillations in the effect. We found no evidences that stochastic fluctuations in a linear effect can trigger grand minima episodes in this model. In contrast, the model used points out that possible mechanism that can trigger grand minima should involve the meridional circulation, magnetic diffusivity or field intensification by buoyancy driven instabilities.
12 pages, 5 figures, Space Climate Symposium 3, Finland (in press JASTP). Version 3.0 incorporates new figures and references
References in corpus (2)
Cited by in corpus (11)
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