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<p>The present paper describes the construction of a global spherical harmonic model of the geomagnetic field, developed as the USTHB (University of Science and Technology Houari Boumediene) candidate for the 14th generation of International Geomagnetic Reference Field (IGRF). The model is based on scalar and vector data collected by the three satellites of the ESA Swarm mission. From 2&#xa0;years of Swarm A observations, we derived the IGRF for the epoch 2025, its predictive secular variation (SV) for the 5-year period 2025.0–2030.0, as well as the Definitive Geomagnetic Reference Field (DGRF) for the epoch 2020.0. A brief description of the data sets, selection criteria, and the modelling methodology used to construct our candidate model is provided.</p> Graphical Abstract <p></p>

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Geomagnetic field modelling and USTHB IGRF-14 candidates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月17日

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  • Abdenaceur Lemgharbi,
  • M. Hamoudi,
  • V. Lesur,
  • M. Mandea,
  • T. Amezza,
  • A. Abtout

摘要

The present paper describes the construction of a global spherical harmonic model of the geomagnetic field, developed as the USTHB (University of Science and Technology Houari Boumediene) candidate for the 14th generation of International Geomagnetic Reference Field (IGRF). The model is based on scalar and vector data collected by the three satellites of the ESA Swarm mission. From 2 years of Swarm A observations, we derived the IGRF for the epoch 2025, its predictive secular variation (SV) for the 5-year period 2025.0–2030.0, as well as the Definitive Geomagnetic Reference Field (DGRF) for the epoch 2020.0. A brief description of the data sets, selection criteria, and the modelling methodology used to construct our candidate model is provided.

Graphical Abstract