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Based on satellite data, both large and small-scale flows were identified onthe core surface .At the same time, the observed rapid decrease in the dipolecomponent of the main geomagnetic field does not find a satisfactoryexplanation. In the previous papers we carried out the comparative studies ofthe structure of the lowest mantle with the motion path of the small sizecurrent loops approximating the MGF's small-scale anomalies. The hypothesis wasstated that heterogeneities in the lowest mantle structure and the topographicirregularities of the core-mantle boundary associated with ancient subductionzones is one of the primarily responsible for the small-scale vorticesformation and the local MGF variation. In this paper, we carry out theanalogous comparison for the large scale sources approximating the nondipolepart of the geomagnetic field.

The Nondipole Part of the Main Geomagnetic Field and the Large Scale Topographical Heterogeneities of the Core-Mantle Boundary