Fig. 8From: Forecasting yearly geomagnetic variation through sequential estimation of core flow and magnetic diffusionThe unsigned residual \(B_r\) at Earth’s surface for epochs 2012.5 and 2015, from the CHAOS-6 hindcasts obtained with the 2009.0–2010.0 model fitting period, \(L_u = 14\), and with either \(N =0\) (a, b) or \(N = 2\) (c, d). Note the change in colour bar scale compared with Fig. 7Back to article page