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1

Physical modelling of electromagnetic field of auroral electrojet

Kobzova V., Ladanivskyy B., Korepanov V.

Acta Geophysica Polonica

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2003

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Vol. 51, nr 3

337-345

EN

The physical modeling method was to investigate the electromagnetic field of a source imitating the ionospheric electrojet on the surface of three-layer horizontally-homogeneous medium which models the Earth's deep section. Magnetotelluric sounding curves and the spataial structure of electromagnetic field components of the auroral source scale model were estimated. A comparison of the results with those obtained in plane homogenous field and in the field of vertical magnetic dipole located at some altitude above the surface of physical model revealed the following regularities. In the electrojet model field, some specific areas are distinguish with the different types of apperent resistivity curves: over a small area under the center of electrojet, the curves of apparent resistivity are identical with thise of the magnetic dipole; over a great territory under the electrojet, the results of MT sounding are similar to those obtained in the field of a plane homogeneous wave; under the edges of electrojet, substantial deviations from the plane homogeneous source are observed.

2

Physical modeling of the induction vectors above the structures including 3d blocks in the crust

Ladanivsky B., Jankowski J., Ernst T., Kobzova V., Rusiniak L.

Acta Geophysica Polonica

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2002

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Vol. 50, nr 4

575-582

EN

Space and frequency distributions of the induction vectors induced by the 2D subsurface conductive anomaly have been studied using the physical modeling in relation to the deeper 3D crust and 1D mantle structures. It was established that the influence of the 3D block structures of the crust on these vectors is less than the influence of conductivity of the deep mantle structures and than the contrast of resistivities between the sediments and the crust.

3

Physical modeling of electromagnetic field of 3D anisotropic conductance inhomogeneity

Kobzova V., Ladanivsky B., Ernst T.

Acta Geophysica Polonica

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2000

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Vol. 48, nr 3

395-410

EN

The physical modeling method is used to investigate the natural electromagnetic field of a geological medium with anisotropic conductance. A special laboratory installation is used. Scale 3D models of geoelectric sections are created in a 5 x 5 x 0.7 m electrolytic tank. Variations of natural electromagnetic field are simulated by a harmonic plane-homogeneous field. The process of creating anisotropic models of local or regional anisotropic zones of any size or form is developed. The results are presented of analogue modeling of uplift in the upper three-layer section characterized by conductance along lateral axes varying approximately 100 times. MT-sounding curves and the spatial structure of electromagnetic field components of anisotropic and isotropic 3D scale models are compared to estimate the influence of anisotropy.