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| Titel |
Post-processing scheme for modelling the lithospheric magnetic field |
| VerfasserIn |
V. Lesur, M. Rother, F. Vervelidou, M. Hamoudi, E. Thébault |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 4, no. 1 ; Nr. 4, no. 1 (2013-03-07), S.105-118 |
| Datensatznummer |
250017766
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| Publikation (Nr.) |
 copernicus.org/se-4-105-2013.pdf |
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| Zusammenfassung |
| We investigated how the noise in satellite magnetic data affects magnetic
lithospheric field models derived from these data in the special case where
this noise is correlated along satellite orbit tracks. For this we describe
the satellite data noise as a perturbation magnetic field scaled
independently for each orbit, where the scaling factor is a random variable,
normally distributed with zero mean. Under this assumption, we have been able
to derive a model for errors in lithospheric models generated by the
correlated satellite data noise. Unless the perturbation field is known,
estimating the noise in the lithospheric field model is a non-linear inverse
problem. We therefore proposed an iterative post-processing technique to
estimate both the lithospheric field model and its associated noise model.
The technique has been successfully applied to derive a lithospheric field
model from CHAMP satellite data up to spherical harmonic degree 120. The
model is in agreement with other existing models. The technique can, in
principle, be extended to all sorts of potential field data with "along-track"
correlated errors. |
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