空间科学学报2025，Vol.45Issue(6)：1425-1438,14.DOI:10.11728/cjss2025.06.2025-0001
不同时空分辨率地磁模型与地磁台站实测数据对比
Comparison of Geomagnetic Models with Different Spatio-temporal Resolutions and Measured Data from Geomagnetic Stations
摘要
Abstract
This study focuses on four INTERMAGNET geomagnetic stations located in the Arctic re-gion and the South Atlantic Anomaly regions,where rapid geomagnetic changes have been observed in recent years.Utilizing two global geomagnetic field models with different spatial and temporal resolu-tions,the International Geomagnetic Reference Field(IGRF)model and the Swarm model,a multi-field source model that offers the highest spatiotemporal resolution currently available in China.The influ-ence of model spatial resolution and update cycles on observatory measurements is quantitatively assessed.The findings are as follows.In regions without significant lithospheric magnetic anomalies,the IGRF and Swarm models yield relatively consistent results.However,for regions with more prominent lithospheric magnetic anomalies,the Swarm model with higher spatial resolution provides better agree-ment with the measurements.While the IGRF model showed significant temporal drift(often exceeding 100 nT)against station measurements during its five-year non-update period(from 2016 to 2020),the Swarm model exhibited no such drift.The magnitude of the IGRF drift varied regionally,reflecting the heterogeneity of global geomagnetic field variations.These results highlight the need to shorten the up-date interval for core field models during periods of rapid geomagnetic change.Statistical analysis from 120 global INTERMAGNET(International Real-time Magnetic Observatory Network)stations further confirms that,within the IGRF's five-year update cycle,the Swarm model exhibits smaller mean and median absolute deviation compared to the IGRF model.The higher spatiotemporal resolution of the Swarm model yields results that are more consistent with observations and thus offers a more accurate representation of the geomagnetic field.This study provides a valuable basis and reference for the appli-cation of global geomagnetic models.关键词
地磁场模型/地磁台站观测/国际地磁参考场模型/南大西洋异常区Key words
Geomagnetic field model/Geomagnetic observatory observation/IGRF/South Atlantic anomaly分类
天文与地球科学引用本文复制引用
XU Yue,YANG Yanyan,WANG Jie,ZEREN Zhima..不同时空分辨率地磁模型与地磁台站实测数据对比[J].空间科学学报,2025,45(6):1425-1438,14.基金项目
国家自然科学基金项目资助(42274214) （42274214）
