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A spherical cap model of the geomagnetic field over southeast Asia from CHAMP and Swarm satellite observations

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Abstract

In this paper, Spherical Cap Harmonic Analysis (SCHA) method was applied to model the geomagnetic field over Vietnam and adjacent area between 15°S and 25°N latitude and 90°E and 130°E in longitude by using magnetic data recorded on CHAMP and Swarm satellites. The characteristic parameters of the method were set at the maximum index Kint = 8 for internal fields, the spherical cap half-angle θ0 = 20°. The regional geomagnetic field over Vietnam and adjacent areas are modelled for the two epochs (2007.0 and 2015.0). Comparison between the SCHA regional geomagnetic field intensity and its time variation with those from IGRF was carried out. The geomagnetic field intensity \( (E_{F}^{SCHA} ) \) from SCHA model varies between −90 and 98 nT for epoch 2007.0 and between −139 and 143 nT for epoch 2015.0; however, the trends of their time variations are the same over Vietnam. The RMS between the magnetic components from SCHA model and ground observations are in the same order. The amplitude of time variation of total field intensity from SCHA model is about tens nT greater than from IGRF over Vietnam.

Highlights

  • The SCHA has been used for modeling the magnetic field in Vietnam and adjacent area at the epochs 2007.0 and 2015.0 from CHAMP and Swarm data.

  • The regional geomagnetic field intensity \( {\text{E}}_{\text{F}}^{\text{SCHA}} \) varies between −90 and 98 nT for epoch 2007.0 and between −139 and 143 nT for epoch 2015.0, which consists of a crustal field and a party of the core field.

  • The time variation of the regional total magnetic field intensity in the period 2007–2015 from the SCHA method has the amplitude larger than the one from IGRF of about 10 nT in the territory of Vietnam.

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Acknowledgements

We acknowledge the operational support of the CHAMP mission by the German Aerospace Center (DLR). We would like to thank ESA for providing prompt access to the Swarm data. This research was supported by the Vietnam Academy of Science and Technology (VAST05.01/18-19).

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Authors and Affiliations

  1. Institute of Geophysics, Vietnam Academy of Science and Technology, Ha Noi, Vietnam

    Le Truong Thanh, Le Huy Minh & Nguyen Thanh Dung

  2. Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, Universite Felix Houphouet Boigny, UFR-SSMT, Abidjan, Côte d’Ivoire

    Vafi Doumbia

  3. Laboratoire de Physique des Plasmas, Sorbonne Universités, UPMC Univ. Paris 06, UMR 7648, 75005, Paris, France

    Christine Amory-Mazaudier

  4. T/ICT4D, ICTP, International Centre for Theoretical Physics, Strada Costiera, 11, 34151, Trieste, Italy

    Christine Amory-Mazaudier

  5. Graduate University of Science and Technology (GUST), 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam

    Ha Duyen Chau

Authors
  1. Le Truong Thanh
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  2. Le Huy Minh
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  3. Vafi Doumbia
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  4. Christine Amory-Mazaudier
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  5. Nguyen Thanh Dung
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  6. Ha Duyen Chau
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Contributions

Dr. Thanh, main author, carried out the calculations, wrote the manuscript. Dr. Minh gave the idea for the content of paper. Dr. Christine and Prof. Doumbia provided satellite data, improved the manuscript. Prof. Chau and Ms. Dung helped the computations. All authors discussed the results and contributed to the final manuscript.

Corresponding author

Correspondence to Le Truong Thanh.

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Communicated by Arkoprovo Biswas

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Thanh, L.T., Minh, L.H., Doumbia, V. et al. A spherical cap model of the geomagnetic field over southeast Asia from CHAMP and Swarm satellite observations. J Earth Syst Sci 130, 13 (2021). https://doi.org/10.1007/s12040-020-01507-9

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  • DOI: https://doi.org/10.1007/s12040-020-01507-9

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