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The fitting of dipolar magnetic field by a dipole model
  • +8
  • Zhaojin Rong,
  • Yong Wei,
  • Fei He,
  • Lucy Klinger,
  • Yanyan Yang,
  • Jiawei Gao,
  • Zhen Shi,
  • Huapei Wang,
  • Shuhui Cai,
  • Huafeng Qin,
  • Rixiang Zhu
Zhaojin Rong
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences

Corresponding Author:[email protected]

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Yong Wei
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Fei He
Institute of Geology and Geophysics Chinese Academy of Sciences
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Lucy Klinger
The Shanghai Institute for Mathematics and Interdisciplinary Sciences
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Yanyan Yang
National Insitute of Natural Hazards, Ministry of Emergency Management of China
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Jiawei Gao
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Zhen Shi
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences
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Huapei Wang
China University of Geosciences
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Shuhui Cai
Institute of Geology and Geophysics, CAS
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Huafeng Qin
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Rixiang Zhu
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Abstract

Many planets, including Earth, possess a global dipolar magnetic field. To diagnose the interior source of the dipolar field, researchers usually adopt a dipole model consisting of six parameters to fit the observed dataset of the magnetic field. However, the simultaneous fitting of these parameters often leads to multiple local optimum parameter sets. To address this fitting dilemma, a current loop model was recently developed by Rong et al.(2021). This technique can separate and invert the loop parameters successively. Here, we further show how this technique can be reduced and modified to fit a dipole model. The applications of this reduced technique to the model of the International Geomagnetic Reference Field and the Martian crustal field model highlight its unique ability to diagnose both the planetary global dipolar field and the local crustal field anomaly, a capability that sets it apart from existing methods. This technique’s potential impact on geomagnetism and planetary magnetism is significant, given its unique ability to diagnose both the planetary global dipolar field and the local crustal field anomaly.
27 Sep 2024Submitted to ESS Open Archive
28 Sep 2024Published in ESS Open Archive