[SEM17-P02] Spatial distribution of regularity of local geomagnetic jerks and electrical conductivity at the bottom of the mantle
Keywords:geomagnetic jerk, electrical conductivity
Geomagnetic jerks were observed around 2003 and 2007 but the signature of them are strong only in the south Atlantic region (e.g. Chulliat et al., 2010). We showed in a previous work that the regularity of the local geomagnetic jerk around 2007 at Mbour (MBO, Senegal) is significantly higher than that of the global geomagnetic jerks, and suggested that the local geomagnetic jerk can be generated due to the combined effect of toroidal magnetic field variation at the CMB and the electrical heterogeneity at the bottom of the mantle. In this presentation, we show the spatial distribution of the regularity of local geomagnetic jerks and discuss electrical conductivity heterogeneity in the deep mantle.
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