Physics – Geophysics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116610b&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 16, CiteID L16610
Physics
Geophysics
11
Electromagnetics: Electromagnetic Theory, Geomagnetism And Paleomagnetism: Geomagnetic Induction, Magnetospheric Physics: Ring Current, Mathematical Geophysics: Modeling
Scientific paper
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 (Y10) assumption depend systematically on local time, suggesting that source fields contain also a coherent non-axisymmetric component. An extended magnetospheric source model that incorporates a coherent non-axisymmetric quadrupole (Y21), and allows for Earth rotation qualitatively explains the observations.
Balasis Georgios
Egbert Gary D.
Maus Stefan
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