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| Titel |
Interpolation of externally-caused magnetic fields over large sparse arrays using Spherical Elementary Current Systems |
| VerfasserIn |
S. A. McLay, C. D. Beggan |
| 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. 9 ; Nr. 28, no. 9 (2010-09-30), S.1795-1805 |
| Datensatznummer |
250016890
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1795-2010.pdf |
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| Zusammenfassung |
| A physically-based technique for interpolating external magnetic field
disturbances across large spatial areas can be achieved with the Spherical
Elementary Current System (SECS) method using data from ground-based magnetic
observatories. The SECS method represents complex electrical current systems
as a simple set of equivalent currents placed at a specific height in the
ionosphere. The magnetic field recorded at observatories can be used to
invert for the electrical currents, which can subsequently be employed to
interpolate or extrapolate the magnetic field across a large area. We show
that, in addition to the ionospheric currents, inverting for induced
subsurface current systems can result in strong improvements to the estimate
of the interpolated magnetic field. We investigate the application of the SECS
method at mid- to high geomagnetic latitudes using a series of observatory
networks to test the performance of the external field interpolation over
large distances. We demonstrate that relatively few observatories are
required to produce an estimate that is better than either assuming no
external field change or interpolation using latitudinal weighting of
data from two other observatories. |
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