DMSPMAG 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. DMSPMAG was produced from the Defense
Meteorological Satellite Program (DMSP) F15, F16, F17 and F18
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,
nonorthogonality 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.

Figure 1: showing improvement of DMSPMAG1 in Oersted satellite residuals over the 2010 World Magnetic Model (WMM2010)
