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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Investigation of regional variation in core flow models using spherical Slepian functions

Fig. 1

Tangentially geostrophic ambiguous patches used in decomposition. Contours of \(B_r/\cos \theta\) for values less than \(10^6\hbox { nT}\). The shaded regions are the area considered to be ambiguous when the tangentially geostrophic assumption is applied. These regions were defined by considering the locations of closed contours which do not connect to the equator. The \(B_r\) values are from the 2015 IGRF field model (Thébault et al. 2015). This and all other figures in this projection are centered on longitude \(90^{\circ }\)

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