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| Titel |
Toward a new Swarm-based global electromagnetic picture: results from the simultaneous use of Ørsted and CHAMP data |
| VerfasserIn |
François Civet, Benoit Langlais, Olivier Verhoeven, Antoine Mocquet, Mioara Mandea, Aude Chambodut |
| 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 |
250090668
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| Publikation (Nr.) |
 EGU/EGU2014-5377.pdf |
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| Zusammenfassung |
| The electromagnetic properties of the largest part of the Earth’s mantle (down to about 2000
km) can be better characterized thanks to the magnetic field measurements provided by the
recently launched Swarm satellite mission. Here we present a study using both Ørsted and
CHAMP measurements as a unique equivalent before the awaited Swarm ones. Instead of the
usual single-satellite approach, which generally assumes a dipolar geometry for the
external field, we solve the global electromagnetic induction problem by extending
the single-satellite procedure to the multi-satellite case. In addition we use a new
proxy for the temporal variability of the external source derived from aÏă indices and
computed as a function of magnetic local times. The results obtained up to degree three
and for three independent one-year-long time series, demonstrate that this new
proxy leads to an improvement of both spatial (to high latitude, |θ| > 50°), and
temporal resolutions, especially at short periods (between 12h to 10 days). These new
results are compared to previous studies to show the possibilities offered by this new
approach. |
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