The CSES Global Geomagnetic Field Model (CGGM): An IGRF type global geomagnetic field model based on data from the China Seismo-Electromagnetic Satellite. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Earth Planets and Space Année : 2021

The CSES Global Geomagnetic Field Model (CGGM): An IGRF type global geomagnetic field model based on data from the China Seismo-Electromagnetic Satellite.

Yanyan Yang
Pierre Vigneron
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Xuhui Shen
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Zhima Zeren
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Bin Zhou
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Werner Magnes
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Nils Olsen
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Lars Tøffner-Clausen
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Jianpin Huang
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Xuemin Zhang
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Shigeng Yuan
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Lanwei Wang
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Bingjun Cheng
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Roland Lammegger
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Jianpin Dai
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Jun Lin
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Feng Guo
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Jingbo Yu
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Jie Wang
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Yingyan Wu
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Xudong Zhao
Xinghong Zhu
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Résumé

Using magnetic field data from the China Seismo-Electromagnetic Satellite (CSES) mission, we derive a global geomagnetic field model, which we call the CSES Global Geomagnetic Field Model (CGGM). This model describes the Earth’s magnetic main field and its linear temporal evolution over the time period between March 2018 and September 2019. As the CSES mission was not originally designed for main field modelling, we carefully assess the ability of the CSES orbits and data to provide relevant data for such a purpose. A number of issues are identified, and an appropriate modelling approach is found to mitigate these. The resulting CGGM model appearing to be of high enough quality, it is next used as a parent model to produce a main field model extrapolated to epoch 2020.0, which was eventually submitted on October 1, 2019 as one of the IGRF-13 2020 candidate models. This CGGM candidate model, the first ever produced by a Chinese led team, is also the only one relying on a data set completely independent from that used by all other candidate models. A successful validation of this candidate model is performed by comparison with the final (now published) IGRF-13 2020 model and all other candidate models. Comparisons of the secular variation predicted by the CGGM parent model with the final IGRF-13 2020-2025 predictive secular variation also reveals a remarkable agreement. This shows that despite their current limitations, CSES magnetic data can already be used to produce useful IGRF 2020 and 2020-2025 secular variation candidate models to contribute to the official IGRF-13 2020 and predictive secular variation models for the coming 2020-2025 time period. These very encouraging results show that additional efforts to improve the CSES magnetic data quality could make these data very useful for long-term monitoring of the main field and possibly other magnetic field sources, in complement to the data provided by missions such as the ESA Swarm mission.
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Dates et versions

hal-03092984 , version 1 (03-01-2021)
hal-03092984 , version 2 (12-02-2021)

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Yanyan Yang, Gauthier Hulot, Pierre Vigneron, Xuhui Shen, Zhima Zeren, et al.. The CSES Global Geomagnetic Field Model (CGGM): An IGRF type global geomagnetic field model based on data from the China Seismo-Electromagnetic Satellite.. Earth Planets and Space, 2021, 73, pp.45. ⟨10.1186/s40623-020-01316-w⟩. ⟨hal-03092984v2⟩
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