2026
Chulliat, A., Nair, M., & Califf, S. (2026). Candidate geomagnetic field models for IGRF-14 and secular acceleration since 2020. Earth Planets Space. https://doi.org/10.1186/s40623-025-02362-y
World Magnetic Model Error
The World Magnetic Model (WMM) is the standard model for navigation, attitude, and heading referencing systems that use the geomagnetic field. WMM is produced by the United States’ National Geospatial-Intelligence Agency (NGA) and the United Kingdom’s Defence Geographic Centre (DGC). CIRES/NCEI and the British Geological Survey (BGS) jointly developed the WMM. This interactive tool visualizes World Magnetic Model (WMM) errors as a function of altitude and geomagnetic activity.
xDIFI-1 IONOSPHERIC MAGNETIC FIELD MODEL
The Extended Dedicated Ionospheric Field Inversion (xDIFI) model is a CHAMP- and Swarm-based global model of the Sq and equatorial electrojet magnetic fields at mid- and low latitudes. It describes variations in local time, season, and solar flux, and separates primary and induced magnetic fields.
xDIFI-2 IONOSPHERIC MAGNETIC FIELD MODEL
The Extended Dedicated Ionospheric Field Inversion (xDIFI) model is a CHAMP- and Swarm-based global model of the Sq and equatorial electrojet magnetic fields at mid- and low latitudes. It describes variations in local time, season, and solar flux, and separates primary and induced magnetic fields.
DIFI-8 IONOSPHERIC MAGNETIC FIELD MODEL
The Dedicated Ionospheric Field Inversion (DIFI) model is a Swarm-based, global model of the Sq and equatorial electrojet magnetic fields at mid- and low latitudes. It describes variations in local time, season, and solar flux, and separates primary and induced magnetic fields.
2024
Califf, S., Nair, M., Weimer, D., Zachman, N., & Poedjono, B. (2024). Assessment of the Weimer geomagnetic perturbation model for high-latitude positioning and navigation. Space Weather, 22, e2024SW004005. https://doi.org/10.1029/2024SW004005