Fig. 8From: The global geomagnetic field over the historical era: what can we learn from ship-log declinations?The South Atlantic Anomaly at several epochs. The top row shows the field intensity at the Earth’s surface, the second to bottom row the radial field component at the core–mantle boundary. The rows in between depict the standard deviations. The yellow/blue contour line indicates the S1 low field intensity region, according to Hagay et al. (2021)Back to article page