Fig. 4From: Temporal resolution of internal magnetic field modes from satellite dataCharts representing the scaled spatial features (\(\alpha ^j \mathbf {p}^j\), see Eq. (2)) on the global grid for the first four PCA modes, using data from CHAMP. Each vectorial mode is characterised by the three charts \(B_r\), \(B_\theta\) and \(B_\phi\)Back to article page