Mon Dec 15, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Qian, Bohao, Xiong, Chao, Wang, Fengjue, Yang, Yanyan, Rang, Xinyi, and Huang, Yuyang, 2025. WHUEMM: global core field modelling from multiple satellites and comparative evaluation of inversion strategy. Earth, Planets and Space, 77(1):183, doi:10.1186/s40623-025-02313-7.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025EPS...77..183Q,
author = {{Qian}, Bohao and {Xiong}, Chao and {Wang}, Fengjue and {Yang}, Yanyan and {Rang}, Xinyi and {Huang}, Yuyang},
title = "{WHUEMM: global core field modelling from multiple satellites and comparative evaluation of inversion strategy}",
journal = {Earth, Planets and Space},
keywords = {IGRF, Geomagnetic field modelling, Geomagnetic field, Geomagnetic inversion strategy},
year = 2025,
month = nov,
volume = {77},
number = {1},
eid = {183},
pages = {183},
abstract = "{Measurements from low Earth orbit satellites play an important role in
modern geomagnetic field modelling. In this study, we present
two geomagnetic field models, WHUEMM-S, derived by sequential
inversion, and WHUEMM-C, derived by comprehensive inversion.
Both models are constructed from calibrated Swarm A/B, GRACE-FO
1, and CryoSat-2 observations collected between January 2019 and
July 2024. Both models represent the core field with degree 15
spherical harmonics and temporal sixth order B-splines. This
study assesses the impact of these inversion strategies and
evaluates the value of non-dedicated satellites in geomagnetic
field modelling. Power spectral analysis shows that both models
produce a temporally stable main field (MF) energy and secular
variation (SV) energy, with differences from CHAOS-7.18 of about
1 nT$^{2}$ and 1 (nT/year)$^{2}$ for spherical harmonic degrees
below 6. Stronger regularization damping in WHUEMM causes a
sharp decrease in secular acceleration (SA) at degrees above 7.
WHUEMM-C departs from CHAOS-7.18 mainly in the axial dipole and
a few low-order sectoral terms, whereas the high-degree misfits
in WHUEMM-S are probably driven by spectral truncation and
residual external signals. Global MF maps confirm that both
models reproduce mid- and low-latitude features well; however,
at high latitudes WHUEMM-S deviates more from CHAOS-7.18 than
WHUEMM-C does. SV derived from observatory records confirm that
each model maintains smooth temporal end points and reliably
captures long-term trends. This demonstrates that carefully
calibrated, non-dedicated data from GRACE-FO 1 and CryoSat-2 can
be used to build global geomagnetic models without compromising
robustness. Finally, using WHUEMM-S as the parent model, we
produced and submitted three IGRF-14 candidate models.}",
doi = {10.1186/s40623-025-02313-7},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025EP&S...77..183Q},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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