Fig. 7
From: Global maps of the magnetic thickness and magnetization of the Earth’s lithosphere
Examples of spectra for caps with a high QI. The regional spectra (blue curves), together with their best fit realization of the statistical expression (red curves), of the four caps marked with a yellow star on Fig. 6. From the top to the bottom: The cap over North America (Q I=73.3, ε=53 km, M=0.4 A/m), Southern Africa (Q I=79, ε=37 km, M=0.3 A/m), Australia (Q I=75.7, ε=18 km, M=0.7 A/m) and Atlantic ocean (Q I=82.3, ε=17 km, M=0.4 A/m). See the text for a discussion