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A shell model for turbulent dynamos

Published online by Cambridge University Press:  08 June 2011

G. Nigro ,
D. Perrone  and
P. Veltri
G. Nigro
Affiliation:
Università della Calabria, Dipartimento di Fisica and Centro Nazionale Interuniversitario Struttura della Materia, Unità di Cosenza, I-87030 Arcavacata di Rende, Italy email: giusy.nigro@gmail.com
D. Perrone
Affiliation:
Università della Calabria, Dipartimento di Fisica and Centro Nazionale Interuniversitario Struttura della Materia, Unità di Cosenza, I-87030 Arcavacata di Rende, Italy email: giusy.nigro@gmail.com
P. Veltri
Affiliation:
Università della Calabria, Dipartimento di Fisica and Centro Nazionale Interuniversitario Struttura della Materia, Unità di Cosenza, I-87030 Arcavacata di Rende, Italy email: giusy.nigro@gmail.com
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Abstract

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A self-consistent nonlinear dynamo model is presented. The nonlinear behavior of the plasma at small scale is described by using a MHD shell model for fields fluctuations; this allow us to study the dynamo problem in a large parameter regime which characterizes the dynamo phenomenon in many natural systems and which is beyond the power of supercomputers at today. The model is able to reproduce dynamical situations in which the system can undergo transactions to different dynamo regimes. In one of these the large-scale magnetic field jumps between two states reproducing the magnetic polarity reversals. From the analysis of long time series of reversals we infer results about the statistics of persistence times, revealing the presence of hidden long-time correlations in the chaotic dynamo process.

Keywords

Dynamo modelsmagnetic reversalsMHD turbulenceshell models
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 159 - 161
Copyright
Copyright © International Astronomical Union 2011

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