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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2018-26
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Apr 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
A high resolution lithospheric magnetic field model over southern Africa based on a joint inversion of CHAMP, Swarm, WDMAM and ground magnetic field data
Foteini Vervelidou1, Erwan Thébault2, and Monika Korte1 1Helmholtz Centre Potsdam-GFZ German Research Centre for Geosciences, Section 2.3 Geomagnetism, Telegrafenberg, 14473 Potsdam, Germany
2Université de Nantes, Laboratoire de Planetologie et Geodynamique, 44322 Nantes Cedex 3, France
Abstract. We derive a lithospheric magnetic field model up to equivalent Spherical Harmonic degree 1000 over southern Africa. We rely on a joint inversion of satellite, near-surface and ground magnetic field data. The input data set consists of magnetic field vector measurements from the CHAMP satellite, across-track magnetic field differences from the Swarm mission, the World Digital Magnetic Anomaly Map and magnetic field measurements from repeat stations and three local INTERMAGNET observatories. For the inversion scheme, we use the Revised-Spherical Cap Harmonic Analysis (R-SCHA), a regional analysis technique able to deal with magnetic field measurements obtained at different altitudes. The model is carefully assessed and displayed at different altitudes and its spectral content is compared to high resolution global lithospheric field models. By comparing the shape of its spectrum to a statistical power spectrum of Earth's lithospheric magnetic field, we infer the mean magnetic thickness and the mean magnetization over southern Africa.
Citation: Vervelidou, F., Thébault, E., and Korte, M.: A high resolution lithospheric magnetic field model over southern Africa based on a joint inversion of CHAMP, Swarm, WDMAM and ground magnetic field data, Solid Earth Discuss., https://doi.org/10.5194/se-2018-26, in review, 2018.
Foteini Vervelidou et al.
Foteini Vervelidou et al.
Foteini Vervelidou et al.

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