Figure 9

Series of the LLS field coefficients. Normalized times series of the coefficients \(\tilde {h}_{n}^{m}\) (top) and \(\tilde {v}_{n}^{m}(t)\) (bottom). Error bars (grey-shaded area) are the square root of the diagonal elements of the posterior covariance matrices \({\sf H}_{\sf h}^{-1}\) and \({\sf H}_{\sf v}^{-1}\). Series are normalized by the standard deviation of the mean model coefficients (in black) calculated over 1960 to 2010, whose value (in nT) is given to the right of each series.