Fig. 4From: Towards probing Earth’s upper mantle with daily magnetic field variations: exploring a physics-based parametrization of the sourceCumulative variance for the first 30 spatial modes of PCA applied to the whole 338 days TIE-GCM time series and plotted for each period, P = 24, 12, 8, 6, 4.8, and 4 h. FT segment length is 24 h. Dashed and dash-dotted lines mark the 95% and 99% thresholds, respectivelyBack to article page