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Modeling of deep magnetovariation soundings on the rotating earth

Semenov V. Y., Hvoždara M., Vozár J.

Acta Geophysica

2013

Vol. 61, no. 2

264--280

Induced magnetic fields in the Earth arise due to two phenomena: induction generated by the time-variable exciting field and the motional induction caused by movement of the conductive planet in the outer magnetic fields. The comparison of both approaches on the spherical Earth has been analyzed in the present work for two sources in the ionosphere and magnetosphere. For this aim, both sources with their natural sizes and positions have been modeled analytically to obtain the fields on the layered sphere at the middle latitudes. The conditions when the steady ring current field is not influenced by the Earth’s rotation have been established theoretically. The synthetic diurnal magnetograms were used for the deep sounding by the magnetovariation spatial gradient method and the result was compared with the one obtained on the non- rotating sphere. Sounding results using both approaches were found different above the 2D inhomogeneous mantle. The precessions of the magnetospheric belt current pole for daily sampling frequency were presented using several geomagnetic observatory data in the northern hemisphere.

Laboratory and geophysical implications for explanation of the nature of Carpathian conductivity anomaly

Hvoždara M., Vozár J.

Acta Geophysica Polonica

2004

Vol. 52, nr 4

497-508

We present a synthetic review of laboratory data, theoretical formulae and relevant geophysical/geological knowledge concerning the Western Carpathians which can be used for explanation of the Carpathian conductivity anomaly below the flysch zone. Implications in favour of the alternative with mineralized (saline) water in pores of crustal rocks at depths of 10-25 km are given. The effect of high temperature and pressure is taken into account too. The alternative with graphitic films in pores is also admitted, but there are geological implications that this effect is not prevailing because of young age of the outer Western Carpathians.