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| Titel |
Intermittency and multifractional Brownian character of geomagnetic time series |
| VerfasserIn |
G. Consolini, R. Marco, P. Michelis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 4 ; Nr. 20, no. 4 (2013-07-11), S.455-466 |
| Datensatznummer |
250018983
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| Publikation (Nr.) |
 copernicus.org/npg-20-455-2013.pdf |
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| Zusammenfassung |
| The Earth's magnetosphere exhibits a complex behavior in response to the
solar wind conditions. This behavior, which is described in terms of
mutifractional Brownian motions, could be the consequence of the occurrence
of dynamical phase transitions. On the other hand, it has been shown that the
dynamics of the geomagnetic signals is also characterized by intermittency at
the smallest temporal scales. Here, we focus on the existence of a possible
relationship in the geomagnetic time series between the multifractional
Brownian motion character and the occurrence of intermittency. In detail, we
investigate the multifractional nature of two long time series of the
horizontal intensity of the Earth's magnetic field as measured at L'Aquila
Geomagnetic Observatory during two years (2001 and 2008), which correspond to
different conditions of solar activity. We propose a possible double origin
of the intermittent character of the small-scale magnetic field fluctuations,
which is related to both the multifractional nature of the geomagnetic field
and the intermittent character of the disturbance level. Our results suggest
a more complex nature of the geomagnetic response to solar wind changes than
previously thought. |
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