Fig. 5From: Statistical analysis of geomagnetic field intensity differences between ASM and VFM instruments onboard Swarm constellationExample of PSD. a Fourier power spectral density (PSD) of each IMF k identified in the decomposition of \(\Delta F_{\mathrm{P}}\) for Swarm A and reported in Fig. 4. b Average frequencies \(< f_k>\) estimated for each IMF versus the IMF number k Back to article page