Local time effects in satellite estimates of electromagnetic induction transfer function Public Deposited

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copyrighted by American Geophysical Union

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  • The current satellite magnetic missions offer new opportunities to determine the electrical conductivity of the Earth. However, satellites are nearly stationary in local time and therefore sample the inducing and induced fields quite differently than geomagnetic observatories, which rotate with the Earth. We show that estimates of induction transfer functions obtained from CHAMP magnetic data under the traditional symmetric magnetospheric ring current source (Y⁰₁ ) assumption depend systematically on local time, suggesting that source fields contain also a coherent nonaxisymmetric component. An extended magnetospheric source model that incorporates a coherent nonaxisymmetric quadrupole (Y¹₂), and allows for Earth rotation qualitatively explains the observations.
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  • Balasis, G., G. D. Egbert, and S. Maus (2004), Local time effects in satellite estimates of electromagnetic induction transfer functions, Geophys. Res. Lett., 31, L16610.
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  • description.provenance : Submitted by Mary Phan (mpscanner@gmail.com) on 2010-04-26T21:28:04Z No. of bitstreams: 1 Balasis et al GRL 2004.pdf: 129053 bytes, checksum: ff09b37cf3d3a542740c34651f734c53 (MD5)
  • description.provenance : Made available in DSpace on 2010-04-26T21:31:21Z (GMT). No. of bitstreams: 1 Balasis et al GRL 2004.pdf: 129053 bytes, checksum: ff09b37cf3d3a542740c34651f734c53 (MD5) Previous issue date: 2004
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-04-26T21:31:21Z (GMT) No. of bitstreams: 1 Balasis et al GRL 2004.pdf: 129053 bytes, checksum: ff09b37cf3d3a542740c34651f734c53 (MD5)

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