Abstract
Summary The hypothesis that the geomagnetic field at the core-mantle boundary can induce an effective viscosity sufficient to give SH reflection coefficients significantly different from unity is investigated in detail for incident SH waves with the magnetic field in the plane of incidence. For earthlike parameters the effective viscosity is found to be smaller than any theoretical estimates. Here μ is viscosity, β cos θ the normal component of the magnetic field, p density, σ electrical conductivity and ω the frequency of the incident wave. Primed quantities are measured in the mantle and unprimed in the core. It is suggested that a (comparatively) thin zone of high effective viscosity, 5–10 km thick, could resolve the discrepancy between theoretical and seismic core viscosity estimates.
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