In contrast to the Magsat model, all three Oersted models exhibit North-South features of alternating polarities in the South Atlantic and South America coincident with the South Atlantic Anomaly (SAA). These features are not associated with any known lithospheric anomaly and are likely to be an artifact. In the Florida State (FSU) model these extend across much of the low to mid southern latitudes. These artifacts are of smallest areal extent in the OIFM model and only slightly more extensive in the IPGP model.
A Comprehensive Model of the Near-Earth Magnetic Field: Phase 3 (CMP3 model)
Oersted Initial Field Model (OIFM)
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Last modified on May 15, 2001