Biography:

In the past A.M. Osella has collaborated on articles with A. Favetto and S. Duhau. One of their most recent publications is Distortions in long-period geomagnetic variations owing to deep electrical inhomogeneities. Which was published in journal Physics of the Earth and Planetary Interiors.

More information about A.M. Osella research including statistics on their citations can be found on their Copernicus Academic profile page.

A.M. Osella's Articles: (4)

Distortions in long-period geomagnetic variations owing to deep electrical inhomogeneities

AbstractThe effect produced by a sharp discontinuity in the upper boundary of the conductosphere is analysed in order to evaluate the distortions introduced in geomagnetic variation profiles in the long-period range of the spectra. To do so, a conformal mapping method is applied and the results are compared with the ones obtained in the case of lateral homogeneity. This model is also applied to interpret the internal part of the geomagnetic daily variations at the equatorial zones of Peru and central Africa.

Depth of the conductosphere under the Indian shield

AbstractThe depth at which the highly conducting layer of the upper mantle, the conductosphere, begins under the Indian shield is estimated. To do this, the geomagnetic daily variations measured north of the magnetic equator are separated into contributions of internal and external origin, and from the latter an analytical representation for the ionospheric current system is inferred. The external field produced by this current and the field induced by it in a two-layer conductivity model of the Earth consisting of an insulator overlying a perfect conductor are obtained. The total field thus calculated is compared with the data to obtain the conductosphere depth.The conductosphere below the Indian shield is found to be located at approximately 1000 km, well below the average global value, in agreement with previous findings below the African shield. This result supports the hypothesis that there is a correlation between the deep conducting structure of the Earth and some tectonic features.

Description of the coastal effect at equatorial latitudes with applications to the Peruvian and Nigerian zones

AbstractThe problem of the electromagnetic induction produced by a localized and an extended ionospheric current near an ocean coast, over a mantle of infinite conductivity, has been reduced to the solution of an integral equation where the induced current density appears in an implicit form. This formalism is applied to calculate the field induced by the geomagnetic daily variation due to the presence of the ocean at the Peruvian and Nigerian equatorial zones.

MT studies in the southeast region of Tucuman Plain, NW Argentina

AbstractDuring July 1990, new magnetotelluric measurements were carried out at four stations along an 85 km profile in the southeastern region of the Tucuman Plain. These data were analyzed to study the resistive structure of the sedimentary basin and the upper crust. The new observations complement previous magnetotelluric, gravity and tectonic investigations showing an important subsurface trough with a sedimentary fill more than 3000 m thick. Further evidence was obtained concerning the presence of a highly conductive layer at 10 km depth that may be related to the presence of a hyperthermal layer.

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