Publication Date:
2020-07-23
Description:
Understanding the complex behavior of the near-Earth electromagnetic environment is one of
the main challenges of Space Weather studies. This includes both the correct characterization of the different
physical mechanisms responsible for its configuration and dynamics as well as the efforts which are
needed for a correct forecasting of several phenomena. By using a nonlinear multi-scale dynamical systems
approach, we provide here new insights into the scale-to-scale dynamical behavior of both quiet and disturbed
periods of geomagnetic activity. The results show that a scale-dependent dynamical transition occurs
when moving from short to long timescales, i.e., from fast to slow dynamical processes, the latter being
characterized by a more regular behavior, while more dynamical anomalies are found in the behavior of
the fast component. This suggests that different physical processes are typical for both dynamical regimes:
the fast component, being characterized by a more chaotic and less predictable behavior, can be related to
the internal dynamical state of the near-Earth electromagnetic environment, while the slow component
seems to be less chaotic and associated with the directly driven processes related to the interplanetary
medium variability. Moreover, a clear difference has been found between quiet and disturbed periods,
the former being more complex than the latter. These findings support the view that, for a correct forecasting
in the framework of Space Weather studies, more attention needs to be devoted to the identification of
proxies describing the internal dynamical state of the near-Earth electromagnetic environment.
Description:
Published
Description:
25
Description:
1A. Geomagnetismo e Paleomagnetismo
Description:
JCR Journal
Keywords:
Earth's magnetospheric dynamics
;
geomagnetic storms and substorms
;
empirical mode decomposition
;
geomagnetic indices
;
04.05. Geomagnetism
;
01.03. Magnetosphere
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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