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Authors: De Michelis, P.*
Tozzi, R.*
Consolini, G.*
Title: Principal components’ features of mid-latitude geomagnetic daily variation
Title of journal: Annales Geophysicae
Series/Report no.: 12/28 (2010)
Publisher: Copernicus Publications on behalf of the European Geosciences Union
Issue Date: 2010
Keywords: Geomagnetic time variations
Magnetospheric current systems
Abstract: 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 timedependent 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.
Appears in Collections:05.01.04. Statistical analysis
04.05.02. Geomagnetic field variations and reversals
Papers Published / Papers in press

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