scholarly journals Fifth-generation lithospheric magnetic field model from CHAMP satellite measurements

2007 ◽  
Vol 8 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Stefan Maus ◽  
Hermann Lühr ◽  
Martin Rother ◽  
Kumar Hemant ◽  
George Balasis ◽  
...  
2018 ◽  
Author(s):  
Foteini Vervelidou ◽  
Erwan Thébault ◽  
Monika Korte

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.


2013 ◽  
Vol 56 (10) ◽  
pp. 1759-1768 ◽  
Author(s):  
JiaMing Ou ◽  
AiMin Du ◽  
E. Thébault ◽  
WenYao Xu ◽  
XiaoBo Tian ◽  
...  

2014 ◽  
Vol 7 (6) ◽  
pp. 8477-8503
Author(s):  
J. Du ◽  
C. Chen ◽  
V. Lesur ◽  
L. Wang

Abstract. General expressions of magnetic vector (MV) and magnetic gradient tensor (MGT) in terms of the first- and second-order derivatives of spherical harmonics at different degrees and orders, are relatively complicated and singular at the poles. In this paper, we derived alternative non-singular expressions for the MV, the MGT and also the higher-order partial derivatives of the magnetic field in local north-oriented reference frame. Using our newly derived formulae, the magnetic potential, vector and gradient tensor fields at an altitude of 300 km are calculated based on a global lithospheric magnetic field model GRIMM_L120 (version 0.0) and the main magnetic field model of IGRF11. The corresponding results at the poles are discussed and the validity of the derived formulas is verified using the Laplace equation of the potential field.


2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Erwan Thébault ◽  
Pierre Vigneron ◽  
Benoit Langlais ◽  
Gauthier Hulot

Solid Earth ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 897-910 ◽  
Author(s):  
Foteini Vervelidou ◽  
Erwan Thébault ◽  
Monika Korte

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.


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