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Mean electromotive force generated by asymmetric fluid flow near the surface of Earth's outer core
Author(s) -
Bhattacharyya Archana
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl01387
Subject(s) - earth's magnetic field , geostrophic wind , geophysics , geomagnetic pole , physics , geology , outer core , electromotive force , inner core , zonal flow (plasma) , inviscid flow , magnetic field , northern hemisphere , mechanics , atmospheric sciences , plasma , quantum mechanics , tokamak
The ф‐component, ϵ ф , of the mean electromotive force generated by asymmetric flow of fluid just beneath the core‐mantle boundary (CMB), is obtained using a geomagnetic field model. This analysis is based on the supposition that the axisymmetric part of fluid flow beneath the CMB is tangentially geostrophic and toroidal. For all the epochs studied, the computed ϵ ф is stronger in the southern hemisphere than that in the northern hemisphere. Assuming a linear relationship between and the azimuthally averaged magnetic field , the only non‐zero off‐diagonal components of the pseudotensor α ij relating to , are estimated as functions of colatitude θ and the physical implications of the results are discussed.