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- W2329481927 abstract "The magnetotelluric method (MT) for the determination of subsurface electrical conductivity is based on the assumption that the incident field is laterally uniform and it is considered as plane waves. In the mid latitudes this hypothesis is valid and MT response depends only on the electrical structure of the earth. In equatorial latitudes, the geomagnetic fields shows an strong enhancement associated with electrical currents located in the ionosphere above the magnetic equator, termed Equatorial Electrojet (EEJ), which can make the primary fields nonuniform. These currents present flow reversions, therefore denominated Counter-Electrojet (CEJ). We present in this work the influence that a 2-D structure perpendicular to the EEJ would cause on the MT soundings. In this situation, we evaluated the coupled TE and TM modes using the finite element method and we employed three gaussian distributions to model the EEJ and its return currents, as well as the CEJ. The results are shown as MT soundings located in three stations crossing the 2-D structure. We noted that the components of the geomagnetic field, used to evaluate the impedance, have an influence from the coupling factor. Moreover, this influence became greater with decreasing of the frequency. For lower frequencies, about 10−4 Hz, we detect two kinds of perturbations on the MT data with respect to the plane-wave one: the first is due the presence of the 2-D source (EEJ and CEJ) as primary field, which violates the plane-wave hypothesis; and the second is caused by the coupled TE and TM modes." @default.
- W2329481927 created "2016-06-24" @default.
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- W2329481927 date "2005-01-01" @default.
- W2329481927 modified "2023-10-14" @default.
- W2329481927 title "MT modeling of a 2-D structure perpendicular to the Equatorial Electrojet" @default.
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- W2329481927 doi "https://doi.org/10.3997/2214-4609-pdb.160.sbgf043" @default.
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