Fig. 11
From: Geomagnetic secular variation violating the frozen-flux condition at the core surface
The 
and 
components of the Gauss coefficients (not renormalized) for the input SV 
o (black solid curve) compared with the same components for (a) the non-advective SV na and (b) the non-geostrophic SV ng computed from CM4 for 1960.0–2002.0, with the truncation degrees LMF = 8 (light gray curve), 13 (dark gray curve), and 18 (dashed, dotted and dot-dashed curves). For LMF = 18, three results are plotted in accordance with different sets of the synthetic coefficients 
and 
(14 = l = 18) generated using Eqs. (13) and (14), with phase parameters selected three times randomly.