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      Very Slow Rotation of Earth's Inner Core From 1971 to 1974

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      Geophysical Research Letters
      American Geophysical Union (AGU)

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          ObsPy: A Python Toolbox for Seismology

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            Seismological evidence for differential rotation of the Earth's inner core

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              Fast torsional waves and strong magnetic field within the Earth's core.

              The magnetic field inside the Earth's fluid and electrically conducting outer core cannot be directly probed. The root-mean-squared (r.m.s.) intensity for the resolved part of the radial magnetic field at the core-mantle boundary is 0.3 mT, but further assumptions are needed to infer the strength of the field inside the core. Recent diagnostics obtained from numerical geodynamo models indicate that the magnitude of the dipole field at the surface of a fluid dynamo is about ten times weaker than the r.m.s. field strength in its interior, which would yield an intensity of the order of several millitesla within the Earth's core. However, a 60-year signal found in the variation in the length of day has long been associated with magneto-hydrodynamic torsional waves carried by a much weaker internal field. According to these studies, the r.m.s. strength of the field in the cylindrical radial direction (calculated for all length scales) is only 0.2 mT, a figure even smaller than the r.m.s. strength of the large-scale (spherical harmonic degree n
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                Author and article information

                Journal
                Geophysical Research Letters
                Geophys. Res. Lett.
                American Geophysical Union (AGU)
                0094-8276
                1944-8007
                August 21 2019
                August 21 2019
                Affiliations
                [1 ]Department of Earth SciencesUniversity of Southern California Los Angeles CA USA
                Article
                10.1029/2019GL083774
                09e67d93-ff4a-48c5-8a7a-c4c599873eb2
                © 2019

                http://onlinelibrary.wiley.com/termsAndConditions#am

                http://onlinelibrary.wiley.com/termsAndConditions#vor

                http://doi.wiley.com/10.1002/tdm_license_1.1

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