Chinese Geomagnetic Reference Field 2020 by the Revised Surface Spline Method

Bin Chen; Jiehao Yuan; Zhe Ni; Can Wang

doi:10.3390/app12052297

Applied Sciences (Feb 2022)

Chinese Geomagnetic Reference Field 2020 by the Revised Surface Spline Method

Bin Chen,
Jiehao Yuan,
Zhe Ni,
Can Wang

Affiliations

Bin Chen: Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
Jiehao Yuan: Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
Zhe Ni: Earthquake Agency of Yunnan Provience, China Earthquake Administration, Kunming 650041, China
Can Wang: Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

DOI: https://doi.org/10.3390/app12052297
Journal volume & issue: Vol. 12, no. 5
p. 2297

Abstract

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We improved the surface spline method to make the centers of the base functions fixed. This improvement makes it meaningful to analyze the time series of coefficients. Based on the revised surface spline (RSS) method and 2382 geomagnetic data measured in mainland China, we built Chinese Geomagnetic Reference Field 2020 (CGRF2020) to describe the spatial distribution of the geomagnetic field in most of China and surrounding areas. The root mean square residual is 0.1318 degrees for D, 0.0857 degrees for I, 93.70 nT for F, 73.94 nT for X, 65.02 nT for Y, and 97.82 nT for Z. The values of F, X, Y, and Z are about 20 nT less than those by the SCH method and IGRF13. We also preliminarily analyzed the correlation between geomagnetic anomalies and geological structures.

Published in Applied Sciences

ISSN: 2076-3417 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General); Science: Biology (General); Science: Physics; Science: Chemistry
Website: http://www.mdpi.com/journal/applsci

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