Dipole Field Patterns

Concern about the damage to satellites that travel in the region of the South Atlantic-South American anomaly (Figure 2.20) has led scientists to consider various ways to depict the Earth's field in that special region. Using the 1995 IGRF field model data, one researcher compared the field patterns for two dipole fields: the dipole centered with the Earth but tilted as with the geomagnetic coordinate poles (Section 3.2.3, p. 78) and the eccentric axis dipole (Section 3.2.4, p. 80). The purpose was to see which display best illustrated the main field patterns in the anomaly region. Comparing the results in Figure 5.6 with Figure 2.21, it is obvious that the field from the eccentric axis poles depicts the anomaly region best.

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