Is current disruption associated with an inverse cascade?

Current disruption (CD) and the related kinetic instabilities in the near-Earth magnetosphere represent physical mechanisms which can trigger multi-scale substorm activity including global reorganizations of the magnetosphere. Lui et al. (2008) proposed a CD scenario in which the kinetic scale linea...

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Main Authors: Z. Vörös, A. Runov, M. P. Leubner, W. Baumjohann, M. Volwerk
Format: Article
Language:English
Published: Copernicus Publications 2010-06-01
Series:Nonlinear Processes in Geophysics
Online Access:http://www.nonlin-processes-geophys.net/17/287/2010/npg-17-287-2010.pdf
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spelling doaj-2b7892e705a64e2b9e79250373b4be832020-11-24T22:45:28ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462010-06-0117328729210.5194/npg-17-287-2010Is current disruption associated with an inverse cascade?Z. VörösA. RunovM. P. LeubnerW. BaumjohannM. VolwerkCurrent disruption (CD) and the related kinetic instabilities in the near-Earth magnetosphere represent physical mechanisms which can trigger multi-scale substorm activity including global reorganizations of the magnetosphere. Lui et al. (2008) proposed a CD scenario in which the kinetic scale linear modes grow and reach the typical dipolarization scales through an inverse cascade. The experimental verification of the inverse nonlinear cascade is based on wavelet analysis. In this paper the Hilbert-Huang transform is used which is suitable for nonlinear systems and allows to reconstruct the time-frequency representation of empirical decomposed modes in an adaptive manner. It was found that, in the Lui et al. (2008) event, the modes evolve globally from high-frequencies to low-frequencies. However, there are also local frequency evolution trends oriented towards high-frequencies, indicating that the underlying processes involve multi-scale physics and non-stationary fluctuations for which the simple inverse cascade scenario is not correct. http://www.nonlin-processes-geophys.net/17/287/2010/npg-17-287-2010.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Z. Vörös
A. Runov
M. P. Leubner
W. Baumjohann
M. Volwerk
spellingShingle Z. Vörös
A. Runov
M. P. Leubner
W. Baumjohann
M. Volwerk
Is current disruption associated with an inverse cascade?
Nonlinear Processes in Geophysics
author_facet Z. Vörös
A. Runov
M. P. Leubner
W. Baumjohann
M. Volwerk
author_sort Z. Vörös
title Is current disruption associated with an inverse cascade?
title_short Is current disruption associated with an inverse cascade?
title_full Is current disruption associated with an inverse cascade?
title_fullStr Is current disruption associated with an inverse cascade?
title_full_unstemmed Is current disruption associated with an inverse cascade?
title_sort is current disruption associated with an inverse cascade?
publisher Copernicus Publications
series Nonlinear Processes in Geophysics
issn 1023-5809
1607-7946
publishDate 2010-06-01
description Current disruption (CD) and the related kinetic instabilities in the near-Earth magnetosphere represent physical mechanisms which can trigger multi-scale substorm activity including global reorganizations of the magnetosphere. Lui et al. (2008) proposed a CD scenario in which the kinetic scale linear modes grow and reach the typical dipolarization scales through an inverse cascade. The experimental verification of the inverse nonlinear cascade is based on wavelet analysis. In this paper the Hilbert-Huang transform is used which is suitable for nonlinear systems and allows to reconstruct the time-frequency representation of empirical decomposed modes in an adaptive manner. It was found that, in the Lui et al. (2008) event, the modes evolve globally from high-frequencies to low-frequencies. However, there are also local frequency evolution trends oriented towards high-frequencies, indicating that the underlying processes involve multi-scale physics and non-stationary fluctuations for which the simple inverse cascade scenario is not correct.
url http://www.nonlin-processes-geophys.net/17/287/2010/npg-17-287-2010.pdf
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