Fig. 11From: Recent geomagnetic secular variation from Swarm and ground observatories as estimated in the CHAOS-6 geomagnetic field modelQuasi-geostrophic core flow in 2015 to degree 16, derived from the CHAOS-6 magnetic field to degree 13, and secular variation to degree 16, following the method of Gillet et al. (2015b). The presented flow is the ensemble average. Green lines are tracers of the instantaneous core flow, with line width indicating the flow strength. The rms flow magnitude is 31.7 km/year. The blue-orange background is \(B_r\) at the core surface in 2015, units mTBack to article page