Fig. 6From: Geomagnetic secular variation violating the frozen-flux condition at the core surfaceMaps of radial SV at the CMB, for (top) the input SV (o)r and (bottom) the non-geostrophic SV (ng)r, each from (a) GRIMM (LMF = 12) at 2003.5 and (b) CM4 (LMF = 13) at 1980.0. The null-flux curves (black curve) are also plotted.Back to article page