Local time effects in satellite estimates of electromagnetic induction transfer function

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/jh343t91c

Descriptions

Attribute Name	Values
Creator	Balasis, Georgios Egbert, Gary D. Maus, Stefan
Abstract	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.
Resource Type	Article
DOI	https://doi.org/10.1029/2004GL020147
Date Available	2010-04-26T21:31:21+00:00
Date Issued	2004
Citation	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.
Journal Title	Geophysical Research Letters
Journal Volume	31
Déclaration de droits	Copyright Not Evaluated
Publisher	American Geophysical Union
Language	English [eng]
Replaces	http://hdl.handle.net/1957/15682