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DMSP-MAG is a scientific degree 15 main field model representing the
geomagnetic field in the region from the Earth's surface to an altitude
of a couple of thousand kilometers. The time variations of the internal
field are given by a quadratic representation which includes
secular variation and secular acceleration (Gauss) coefficients of
the magnetic potential. DMSP-MAG was produced from the Defense
Meteorological Satellite Program (DMSP) F-15, F-16, F-17 and F-18
satellites, using vector measurements from January 2010 through July
2013. The DMSP measurements were carefully calibrated to remove
outliers, calculate timing shifts, scale factors, offsets,
non-orthogonality angles, and Euler angles. The scalar measurements
and downward (Z) component were used to construct the model.
The model includes a simple parameterization of the external field,
using a spherical harmonic degree 1 expansion of the field aligned
with the internal field, and using provided Est and Ist indices
to represent the external and induced components of the field.
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Figure 1: showing improvement of DMSP-MAG-1 in Oersted satellite residuals over the 2010 World Magnetic Model (WMM2010)
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