Fig. 9From: A comprehensive model of Earth’s magnetic field determined from 4 years of Swarm satellite observationsThe \(R_n(a)\) spectra (Lowes 1966; Sabaka et al. 2015, 2016) of the time-averaged oceanic \(M_2\) tidal magnetic field at \(a=6371.2\,\hbox {km}\) for SH degrees \(n=1{-}36\) from models determined by 2, 3, and 4 (CIY4) years of Swarm data and from CHAMP data (CM5)Back to article page