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Article
Open AccessModelling the Earth’s core magnetic field under flow constraints
Two recent magnetic field models, GRIMM and xCHAOS, describe core field accelerations with similar behavior up to Spherical Harmonic (SH) degree 5, but which differ significantly for higher degrees. These disc...
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Article
Geomagnetic Core Field Secular Variation Models
We analyse models describing time changes of the Earth’s core magnetic field (secular variation) covering the historical period (several centuries) and the more recent satellite era (previous decade), and we i...
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Article
Open AccessThe second generation of the GFZ Reference Internal Magnetic Model: GRIMM-2
We present the second generation of the GFZ Reference Internal Magnetic Model (GRIMM-2), that was derived for the preparation of the GFZ candidate for the 11th generation of the IGRF. The model is built by fit...
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Article
Magnetic Field Data Correction in Space for Modelling the Lithospheric Magnetic Field
The Earth’s magnetic field as it is measured by low-Earth orbit satellites such as Swarm and CHAMP results from the superposition of internal and external source fields overlap** in time and in space. The Earth...
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Article
Challenges Handling Magnetospheric and Ionospheric Signals in Internal Geomagnetic Field Modelling
Measurements of the Earth’s magnetic field collected by low-Earth-orbit satellites such as Swarm and CHAMP, as well as at ground observatories, are dominated by sources in the Earth’s interior. However these meas...
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Article
Open AccessInternational Geomagnetic Reference Field: the thirteenth generation
In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted the thirteenth generation of the International Geomagnetic Reference Field (IGRF). T...
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Article
Open AccessEvaluation of candidate models for the 13th generation International Geomagnetic Reference Field
In December 2019, the 13th revision of the International Geomagnetic Reference Field (IGRF) was released by the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group V-MOD. Thi...
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Article
Open AccessRapid Variations of Earth’s Core Magnetic Field
Evidence of fast variations in the Earth’s core field are seen both in magnetic observatory and satellite records. We present here how they have been identified at the Earth’s surface from ground-based observa...
