EMAG2 and a new version of the Magnetic Map of Brazil

The earth`s magnetic field is originated in its nucleus according to the geodynamos theory and propagates throughout the mantle, the crust and far way. Except during the occurrences of magnetic storms, more than 95% of the measured magnetic signal comes from the core. The specialized exploration geophysicist acting on oil/gas or mineral industries has it focus in the interactions of this main field, and the secondary one, induced by the first, on magnetic rocks of upper crust, since de lower crust is hotter than the Curie point. The knowledge of the magnetic signatures of entire countries or even, continents, is a powerful tool to better understand the geological behavior of the upper part of the crust, in which, sedimentary basins, igneous intrusions or metalogenetic provinces are developed. This paper deals with EMAG2 data compared with aeromagnetic data from Arco Purus region in Amazonas State, and does some considerations on a new version of the Brazil Magnetometric Map.