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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

From: The Mag.num core field model as a parent for IGRF-13, and the recent evolution of the South Atlantic Anomaly

Fig. 7

Magnetic field intensity in the South Atlantic and South America with the two minima of the SAA (symbols) and the contour line going through the saddle point between them (black line) at Earth’s surface for a 2013.0 and b 2020.0 from the Mag.num model. White contour lines are given at every \(0.5\mu \text {T}\). The same is shown for a satellite altitude of 450 km in (c) with regular black contour lines every \(\mu \) T. The red line is the time average great circle fitted to the set of minima and saddle points from 2013.0 to 2020.0. Profiles of field intensity along this great circle are shown for Earth’s surface and satellite altitude from 2013.0 to 2020.0 in (d)

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