Fig. 9From: Recovery of the 6-year signal in length of day and its long-term decreasing trendComparison of the 6-year signal from original series and that after the AAM was removed (a); Comparison of the variations of envelope curves (b, c). The black curve is the original 6-year variations; red curve is AAM effect removed. Figure 9 also shows the contribution from AAM effects to the 6-year signal. The AAM effect always reduces the strength of the 6-year signalBack to article page