Fig. 9From: Geomagnetic secular variation violating the frozen-flux condition at the core surfaceTime-averaged spectra of the input SV o from GRIMM (2002.0–2005.0) (black curve), and the non-advective SVs na (light gray curve) and (dark gray curve) computed with the definitions of scalar products (7) and (12), respectively. Each spectrum is plotted with respect to the mean core radius (solid) and 400 km altitude (dashed).Back to article page