Fig. 11From: DTU candidate field models for IGRF-12 and the CHAOS-5 geomagnetic field modelSecular acceleration (SA) at the core surface (degrees 1 to 8 only) in 2006.2 (top), 2009.2 (middle) and 2012.9 (bottom). Maps are in Hammer-Aitoff projection, units are microtesla per year 2 (μT/year 2)Back to article page