Fig. 5
From: Non-monotonic growth and motion of the South Atlantic Anomaly
Radial geomagnetic field (left) and its secular variation (right) at the core–mantle boundary for the mean model of COV-OBS.x1 in 1920 (top), 1960 (middle) and 2000 (bottom). All models are expanded until spherical harmonic degree and order 5. All maps are centered at \(20^\circ \hbox {W}\) \(30^\circ \hbox {S}\), i.e. on the South Atlantic. Note the different scales