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| Titel |
Estimation of the magnetic field gradient tensor using the Swarm constellation |
| VerfasserIn |
Stavros Kotsiaros, Chris Finlay, Nils Olsen |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091325
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| Publikation (Nr.) |
 EGU/EGU2014-5611.pdf |
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| Zusammenfassung |
| For the first time, part of the magnetic field gradient tensor is estimated in space by the
Swarm mission. We investigate the possibility of a more complete estimation of the gradient
tensor exploiting the Swarm constellation. The East-West gradients can be approximated by
observations from the lower pair of Swarm satellites, whereas the North-South gradients can
be approximated by the first differences in the along-track direction. As a preliminary test,
here we will present an analysis of along track differences of CHAMP vector observations.
These show considerably smaller standard deviations compared to conventional
vector observations at almost all latitudes. Analytical and numerical analysis of the
spectral properties of the gradient tensor shows that specific combinations of the
East-West and North-South gradients have almost identical signal content to the radial
gradient. Gradient data are less contaminated by large scale fields produced in the
magnetosphere and ionosphere and specific gradient combinations can lead to an
improved determination of both the lithospheric field and the high degree secular
variation. |
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