Fig. 4
Lowes–Mauersberger spherical harmonic power spectra of the vector magnetic field (black), secular variation (red) and secular acceleration (blue) at the Earth’s surface in 2015
Fig. 4 | Earth, Planets and Space
Lowes–Mauersberger spherical harmonic power spectra of the vector magnetic field (black), secular variation (red) and secular acceleration (blue) at the Earth’s surface in 2015