Study of the fractality in a magnetohydrodynamic shell model forced by solar wind fluctuations
Author
dc.contributor.author
Domínguez Valverde, Macarena
Author
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Nigro, Giuseppina
Author
dc.contributor.author
Muñoz Gálvez, Víctor
Author
dc.contributor.author
Carbone, Vincenzo
Author
dc.contributor.author
Riquelme Hernández, Mario
Admission date
dc.date.accessioned
2020-05-19T21:48:51Z
Available date
dc.date.available
2020-05-19T21:48:51Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Nonlin. Processes Geophys., 27, 175–185, 2020
es_ES
Identifier
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10.5194/npg-27-175-2020
Identifier
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https://repositorio.uchile.cl/handle/2250/174849
Abstract
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The description of the relationship between interplanetary plasma and geomagnetic activity requires complex models. Drastically reducing the ambition of describing this detailed complex interaction and, if we are interested only in the fractality properties of the time series of its characteristic parameters, a magnetohydrodynamic (MHD) shell model forced using solar wind data might provide a possible novel approach. In this paper we study the relation between the activity of the magnetic energy dissipation rate obtained in one such model, which may describe geomagnetic activity, and the fractal dimension of the forcing.
In different shell model simulations, the forcing is provided by the solution of a Langevin equation where a white noise is implemented. This forcing, however, has been shown to be unsuitable for describing the solar wind action on the model. Thus, we propose to consider the fluctuations of the product between the velocity and the magnetic field solar wind data as the noise in the Langevin equation, the solution of which provides the forcing in the magnetic field equation.
We compare the fractal dimension of the magnetic energy dissipation rate obtained, of the magnetic forcing term, and of the fluctuations of v.b(z), with the activity of the magnetic energy dissipation rate. We examine the dependence of these fractal dimensions on the solar cycle. We show that all measures of activity have a peak near solar maximum. Moreover, both the fractal dimension computed for the fluctuations of v.b(z) time series and the fractal dimension of the magnetic forcing have a minimum near solar maximum. This suggests that the complexity of the noise term in the Langevin equation may have a strong effect on the activity of the magnetic energy dissipation rate.
es_ES
Patrocinador
dc.description.sponsorship
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
1161711
1201967
3160305
1191673