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Initial scalar lithospheric magnetic anomaly map of China and surrounding regions derived from CSES satellite data

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Abstract

The China Seismo-Electromagnetic Satellite (CSES), China’s first satellite to measure geophysical fields with scientific goals in both space and solid earth physics, was launched successfully in February 2018. It carries high-precision magnetometers to measure the geomagnetic field. In this study, the CSES magnetic data were used to extract the signal of the lithospheric magnetic field caused by magnetized rocks in the crust and uppermost mantle. First, an along-track analysis of the CSES magnetic data was undertaken near the Bangui magnetic anomaly in central Africa and the Tarim magnetic anomaly in China, demonstrating that the CSES magnetic data are indeed sensitive to the lithospheric magnetic anomaly field. Then a lithospheric magnetic anomaly map over China and surrounding regions was derived. This map is consistent with the lithospheric part of the CHAOS-7 model. In particular, it clearly reveals four major magnetic anomalies containing long-wavelength signals at the altitude of low-earth-orbiting satellites. Three magnetic highs are located over the Tarim, Sichuan and Songliao basin, the origins of which could be related to large-scale tectonic-magmatic activities during geological history. A prominent magnetic low is otherwise found in the southern Himalayan-Tibetan plateau, possibly caused by the shallow Curie depth in this region. To further improve the precision of the lithospheric magnetic field model, more detailed data processing and multi-source data merging are needed.

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Correspondence to XuHui Shen.

Additional information

This work was supported by the China Postdoctoral Science Foundation (Grant No. 2019M660731), the National Key R&D (Research and Development) Program of China (Grant No. 2018YFC1503500) and ISSI-BJ (International Space Science Institute-Beijing) (Grant No. 2019IT-33). Work by Gauthier Hulot and Nils Olsen was supported as part of Swarm DISC activities, funded by ESA (Grant No. 4000109587). Work by Angelo De Santis was supported by LIMADOU-Science Project, funded by ASI (Italian Space Agency). Work of Werner Magnes was supported by the Austrian Space Applications Programme (Grant No. 873688). This work made use of the data from CSES mission (http://leos.ac.cn), a project funded by the China National Space Administration (CNSA) and the China Earthquake Administration (CEA).

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Wang, J., Shen, X., Yang, Y. et al. Initial scalar lithospheric magnetic anomaly map of China and surrounding regions derived from CSES satellite data. Sci. China Technol. Sci. 64, 1118–1126 (2021). https://doi.org/10.1007/s11431-020-1727-0

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  • DOI: https://doi.org/10.1007/s11431-020-1727-0

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