Fig. 5From: Recent geomagnetic secular variation from Swarm and ground observatories as estimated in the CHAOS-6 geomagnetic field modelField intensity (top), its rate of change (middle) and its acceleration (bottom) at Earth’s surface in 2015. Units are \(\mu T=10^3\hbox {nT}\), nT/year and \(\hbox {nT/year}^2\) , respectively. Map projection is Hammer-AitoffBack to article page