Fig. 3
From: Temporal resolution of internal magnetic field modes from satellite data
Singular spectra for CHAMP full (\(\tau _W= 8\) year) dataset (thick blue), CHAMP shortened (\(\tau _W= 3.7\) year) dataset (thin blue) and Swarm (thick red), in logarithmic scale. The standard error associated with each eigenvalue is given by North’s rule of thumb to help identify modes that can be separated. In grey, the straight lines fitted to the noise “plateau”