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Table 1 Table listing the number of spatial modes needed for each period to surpass either 95 or 99% variance (\(\kappa\)) threshold. The list includes PCA results using the full data set and restricting the data to March–April

From: Towards probing Earth’s upper mantle with daily magnetic field variations: exploring a physics-based parametrization of the source

Time Series \(\kappa\) [%] Period [h]
24 12 8 6 4.8 4
Full year 95 3 6 9 12 12 11
99 7 12 18 25 26 25
March–April 95 2 3 5 6 7 7
99 4 6 8 12 13 13