NDLI: Simultaneous solution for core magnetic field and fluid flow beneath an electrically conducting mantle

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Simultaneous solution for core magnetic field and fluid flow beneath an electrically conducting mantle

Content Provider	NASA Technical Reports Server (NTRS)
Author	Voorhies, Coerte V. Nishihama, Masahiro
Copyright Year	1993
Description	The effects of laterally homogeneous mantle electrical conductivity were included in steady, frozen-flux core surface flow estimation along with refinements in method and weighting. The refined method allows simultaneous solution for both the initial radial geomagnetic field component at the core-mantle boundary (CMB) and the sub-adjacent fluid motion; it also features Gauss' method for solving the non-linear inverse problem associated with steady motional induction. The tradeoff between spatial complexity of the derived flows and misfit to the weighted Definitive Geomagnetic Reference Field models (DGRF's) is studied for various mantle conductivity profiles. For simple flow and a fixed initial geomagnetic condition, a fairly high deep-mantle conductivity performs better than either insulating or weakly conducting profiles; however, a thin, very high conductivity layer at the base of the mantle performs almost as well. Simultaneous solution for both initial geomagnetic field and flow reduces the misfit per degree of freedom even more than does changing the mantle conductivity profile. Moreover, when both core field and flow are estimated, the performance of the solutions and the derived flows become insensitive to the conductivity profile.
File Size	878125
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940009487
Archival Resource Key	ark:/13960/t17m56b09
Language	English
Publisher Date	1993-09-01
Access Restriction	Open
Subject Keyword	Geophysics Core-mantle Boundary Geomagnetism Magnetic Induction Core Flow Electrical Resistivity Earth Mantle Steady Flow Earth Core Mathematical Models Magnetic Fields Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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