 |
| Titel |
On the multi-scale nature of large geomagnetic storms: an empirical mode decomposition analysis |
| VerfasserIn |
P. Michelis, G. Consolini, R. Tozzi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 19, no. 6 ; Nr. 19, no. 6 (2012-11-29), S.667-673 |
| Datensatznummer |
250014265
|
| Publikation (Nr.) |
 copernicus.org/npg-19-667-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Complexity and multi-scale are very common properties of several geomagnetic
time series. On the other hand, it is amply demonstrated that scaling
properties of geomagnetic time series show significant changes depending on
the geomagnetic activity level. Here, we study the multi-scale features of
some large geomagnetic storms by applying the empirical mode decomposition
technique. This method, which is alternative to traditional data analysis and
is designed specifically for analyzing nonlinear and nonstationary data, is
applied to long time series of Sym-H index relative to periods
including large geomagnetic disturbances. The spectral and scaling features
of the intrinsic mode functions (IMFs) into which Sym-H time series can
be decomposed, as well as those of the Sym-H time series itself, are
studied considering different geomagnetic activity levels. The results
suggest an increase of dynamical complexity and multi-scale properties for
intermediate geomagnetic activity levels. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|