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Hints on the Multiscale Nature of Geomagnetic Field Fluctuations During Quiet and Disturbed Periods
Language
English
Obiettivo Specifico
1A. Geomagnetismo e Paleomagnetismo
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/126 (2021)
ISSN
0148-0227
Publisher
Wiley- Agu
Pages (printed)
e2020JA028596
Issued date
May 17, 2021
Subjects
Abstract
We analyze the geomagnetic data recorded at 78 stations from 13 to 31 March 2015. Using
the empirical mode decomposition (EMD) method, we focus our attention on geomagnetic signal due
to sources which are external to the Earth, that is, due to current systems flowing in the ionosphere and
magnetosphere. We analyze the short timescale fluctuations (τ < 200 min) of this magnetic signal, their
dependence on magnetic latitude, magnetic local time, and geomagnetic activity. At high geomagnetic
latitudes (>|60°|), these short timescale fluctuations constitute more than 30% of the external magnetic
field. Their maximum contribution occurs along the auroral oval suggesting that they are mainly triggered
by the ionospheric electric current systems active in these regions. A discussion of the relevance of
these short timescale magnetic fluctuations to result in a more significant modeling and prediction of
geomagnetically induced currents in the auroral zones is also provided.
the empirical mode decomposition (EMD) method, we focus our attention on geomagnetic signal due
to sources which are external to the Earth, that is, due to current systems flowing in the ionosphere and
magnetosphere. We analyze the short timescale fluctuations (τ < 200 min) of this magnetic signal, their
dependence on magnetic latitude, magnetic local time, and geomagnetic activity. At high geomagnetic
latitudes (>|60°|), these short timescale fluctuations constitute more than 30% of the external magnetic
field. Their maximum contribution occurs along the auroral oval suggesting that they are mainly triggered
by the ionospheric electric current systems active in these regions. A discussion of the relevance of
these short timescale magnetic fluctuations to result in a more significant modeling and prediction of
geomagnetically induced currents in the auroral zones is also provided.
Type
article
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SantarelliJGR_2021.pdf
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