 |
| Titel |
Is current disruption associated with an inverse cascade? |
| VerfasserIn |
Z. Vörös, A. Runov, M. P. Leubner, W. Baumjohann, M. Volwerk |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 17, no. 3 ; Nr. 17, no. 3 (2010-06-16), S.287-292 |
| Datensatznummer |
250013686
|
| Publikation (Nr.) |
 copernicus.org/npg-17-287-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|