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Statements
1983
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systematic regular perturbation procedure
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weak mantle conduction
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unsteady electromagnetic fields extrapolated downward from Earth's surface to core-mantle boundary
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mantle treated as radially symmetric conductor of highly variable conductivity
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unique poloidal-toroidal decomposition of magnetic vector potential
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three-dimensional
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spherical harmonic analysis
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one-dimensional linear diffusion equations
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inverse poloidal diffusion problem
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diffusion through mantle rapid on time-scale
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changes in forcing at core-mantle boundary
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reference to range of proposed conductivity profiles
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two geomagnetic field models
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uncertainty in conductivity less important than errors in field models
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