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| Titel |
Principal components' features of mid-latitude geomagnetic daily variation |
| VerfasserIn |
P. Michelis, R. Tozzi, G. Consolini |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 12 ; Nr. 28, no. 12 (2010-12-21), S.2213-2226 |
| Datensatznummer |
250016925
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| Publikation (Nr.) |
 copernicus.org/angeo-28-2213-2010.pdf |
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| Zusammenfassung |
The ionospheric and magnetospheric current systems are responsible of the
daily magnetic field changes. Recently, the Natural Orthogonal Components
(NOC) technique has been applied to model the physical system responsible of
the daily variation of the geomagnetic field, efficiently and accurately
(Xu and Kamide, 2004). Indeed, this approach guarantees that the number of parameters
used to represent the physical process is small as much as possible, and
consequently process control for such system becomes apparent.
We focus our present study on the analysis of the hourly means of the
magnetic elements H, D and Z recorded at L'Aquila observatory in Italy from
1993 to 2004. We apply to this dataset the NOC technique to reconstruct the
3-dimensional structures of the different ionospheric and magnetospheric
current systems which contribute to the geomagnetic daily variations. To
support our interpretation in terms of the different ionospheric and
magnetospheric current systems, the spectral and statistical features of the
time-dependent amplitudes associated to the set of natural orthogonal
components are analyzed and compared to those of a set of descriptors of the
magnetospheric dynamics and solar wind changes. |
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