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  Concurrent Effects between Geomagnetic Storms and Magnetospheric Substorms

Alberti, T., Faranda, D., Consolini, G., De Michelis, P., Donner, R. V., Carbone, V. (2022): Concurrent Effects between Geomagnetic Storms and Magnetospheric Substorms. - Universe, 8, 4, 226.
https://doi.org/10.3390/universe8040226

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 Creators:
Alberti, Tommaso1, Author
Faranda, Davide1, Author
Consolini, Giuseppe1, Author
De Michelis, Paola1, Author
Donner, Reik V.2, Author              
Carbone, Vincenzo1, Author
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1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, Potsdam, ou_persistent13              

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 Abstract: An accurate understanding of dissimilarities in geomagnetic variability between quiet and disturbed periods has the potential to vastly improve space weather diagnosis. In this work, we exploit some recently developed methods of dynamical system theory to provide new insights and conceptual ideas in space weather science. In particular, we study the co-variation and recurrence statistics of two geomagnetic indices, SYM-H and AL, that measure the intensity of the globally symmetric component of the equatorial electrojet and that of the westward auroral electrojet, respectively. We find that the number of active degrees of freedom, required to describe the phase space dynamics of both indices, depends on the geomagnetic activity level. When the magnetospheric substorm activity, as monitored by the AL index, increases, the active number of degrees of freedom increases at high latitudes above the dimension obtained through classical time delay embedding methods. Conversely, a reduced number of degrees of freedom is observed during geomagnetic storms at low latitude by analysing the SYM-H index. By investigating time-dependent relations between both indices we find that a significant amount of information is shared between high and low latitude current systems originating from coupling mechanisms within the magnetosphere–ionosphere system as the result of a complex interplay between processes and phenomena of internal origin activated by the triggering of external source processes. Our observations support the idea that the near-Earth electromagnetic environment is a complex system far from an equilibrium.

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Language(s): eng - English
 Dates: 2022-04-062022-04-06
 Publication Status: Finally published
 Pages: 18
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3390/universe8040226
PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: RD1 - Earth System Analysis
MDB-ID: Entry suspended
OATYPE: Gold Open Access
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Title: Universe
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 8 (4) Sequence Number: 226 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/2218-1997
Publisher: MDPI