Journal
EARTH PLANETS AND SPACE
Volume 65, Issue 11, Pages 1233-1237Publisher
SPRINGER
DOI: 10.5047/eps.2013.07.007
Keywords
Electromagnetic induction; 1-D inversion; mantle conductivity; C-responses
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Funding
- European Space Agency through ESTEC [4000102140/10/NL/JA]
- Swiss National Science Foundation [2000021-140711/1]
- Russian Foundation for Basic Research [12-05-00817-a]
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We present an inversion scheme to recover the (1-D) depth profile of mantle conductivity from satellite magnetic data, which takes into account 3-D effects arising from the distribution of oceans and continents. The scheme is based on an iterative inversion of C-responses, which are estimated from time series of the dominating external (inducing) and internal (induced) spherical harmonic coefficients of the magnetic potential due to a magnetospheric source. These time series will be available as a Swarm Level-2 data product. We verify our approach by using synthetic, but realistic time series obtained by simulating induction due to a realistic magnetospheric source in a 3-D target conductivity model of the Earth. This model contains not only a laterally heterogeneous layer representing oceans and continents, but also 3-D inhomogeneities in the mantle. The inversion for mantle conductivity is initiated with a uniform conductivity model. Convergence is reached within a few iterations. The recovered model agrees well with the laterally averaged target model, although the latter comprises large jumps in conductivity. Our 1-D inversion scheme is therefore ready to process Swarm data.
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