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- W2768999318 abstract "Convection in Earth’s core can sustain magnetic-Archemedes-Coriolis (MAC) waves through a variety of mechanisms. Buoyancy and Lorentz forces are viable sources for wave motion, together with the effects of magnetic induction. We develop a quantitative description for zonal MAC waves and assess the source mechanisms using a numerical dynamo model. The largest sources at conditions accessible to the dynamo model are due to buoyancy forces and magnetic induction. However, when these sources are extrapolated to conditions expected in Earth’s core, the Lorentz force emerges as the dominant generation mechanism. This source is expected to produce wave velocities of roughly 2 km yr−1 when the internal magnetic field is characterized by a dimensionless Elsasser number of roughly Λ ≈ 10 and the root-mean-square convective velocity defines a magnetic Reynolds number of Rm ≈ 103. Our preferred model has a radially varying stratification and a constant (radial) background magnetic field. It predicts a broad power spectrum for the wave velocity with most power distributed across periods from 30 to 100 yr." @default.
- W2768999318 created "2017-12-04" @default.
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- W2768999318 date "2017-11-14" @default.
- W2768999318 modified "2023-09-27" @default.
- W2768999318 title "Stochastic generation of MAC waves and implications for convection in Earth’s core" @default.
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- W2768999318 doi "https://doi.org/10.1093/gji/ggx492" @default.
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