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| Titel |
A novel approach to the dynamical complexity of the Earth's magnetosphere at geomagnetic storm time-scales based on recurrences |
| VerfasserIn |
Reik Donner, Georgios Balasis, Veronika Stolbova, Marc Wiedermann, Marina Georgiou, Jürgen Kurths |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131988
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| Publikation (Nr.) |
 EGU/EGU2016-12449.pdf |
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| Zusammenfassung |
| Magnetic storms are the most prominent global manifestations of out-of-equilibrium
magnetospheric dynamics. Investigating the dynamical complexity exhibited by geomagnetic
observables can provide valuable insights into relevant physical processes as well as temporal
scales associated with this phenomenon. In this work, we introduce several innovative data
analysis techniques enabling a quantitative analysis of the Dst index non-stationary behavior.
Using recurrence quantification analysis (RQA) and recurrence network analysis
(RNA), we obtain a variety of complexity measures serving as markers of quiet- and
storm-time magnetospheric dynamics. We additionally apply these techniques to the main
driver of Dst index variations, the V BSouth coupling function and interplanetary
medium parameters Bz and Pdyn in order to discriminate internal processes from the
magnetosphere’s response directly induced by the external forcing by the solar
wind. The derived recurrence-based measures allow us to improve the accuracy with
which magnetospheric storms can be classified based on ground-based observations.
The new methodology presented here could be of significant interest for the space
weather research community working on time series analysis for magnetic storm
forecasts. |
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