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- W180573129 abstract "The magnetic field of the Earth is generated by dynamo action associated with the upwelling of buoyant material in the liquid outer core. It is argued that this upwelling occurs in the form of mushroom-shaped blobs of material released from the mushy zone at the inner core boundary (ICB), and having a very small density defect δρ/ρ. The rise of buoyant material with velocity w is compensated by the slow rate of growth of the solid inner core. The resulting mass balance, combined with approximate geostrophic force balance in the core leads to estimates $$delta rho /rho sim 3 times {10^{ - 9}},w sim 2 times {10^{ - 4}}m/s.$$ Each rising blob drives a Taylor column, and the helicity and α-effect associated with this flow is estimated. A mean-field dynamo driven by this α-effect in conjunction with differential rotation generates a magnetic field whose strength is determined in order of magnitude by the plausible assumption of magnetostrophic equilibrium." @default.
- W180573129 created "2016-06-24" @default.
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- W180573129 date "1989-01-01" @default.
- W180573129 modified "2023-09-27" @default.
- W180573129 title "Liquid Metal MHD and the Geodynamo" @default.
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- W180573129 doi "https://doi.org/10.1007/978-94-009-0999-1_49" @default.
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