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Novel methodology to characterise the complex susceptibility, which is a real problem not only for in situ surveys but at laboratory level. New research that influences the direction of applied physics: description of the development of a prototype based on a new methodology. Breakthrough concept using underlying classical physical principles: complex magnetic susceptibility and inductive instrumentation. Great application in many disciplines including fundamental physics, mining, geophysics, geology, engineering, oil industry, etc. A device named magnetic susceptometer for a complete determination of the magnetic complex susceptibility of materials and minerals has been conceived and manufactured as a complement for the in situ characterization of rocks during high resolution magnetic prospections. In this work a device and its capabilities for susceptibility measurements are described, the calibration performed with artificial samples, and the values of real and imaginary susceptibility of natural samples in a range comprising: χ = 10−4 to 10−7 [SI], representative of Earth and also Mars rocks. This work has been funded by the projects PRI-PIBUS-2011-1150, PRI-PIBUS-2011-1182, ESP2015-70184-R and 730041 − NEWTON. Peerreview

9 pages, 11 figures, 1 table.-- Available online Nov 7, 2001., An improved model of geomagnetic secular change for the Antarctic was developed using observatory annual mean values measured in Antarctica during the last 40 years. Spherical cap harmonic analysis (SCHA) with a power series time dependence was used to model spatial and temporal variations of main field differences at spatial wavelengths from 3000 to 13,000 km. The model was designed to facilitate merging satellite, airborne, marine and terrestrial magnetic data sets recorded at very different epochs in the Antarctic where significant annual geomagnetic changes have occurred. It improves the fit to observatory data by up to about 50% relative to the International Geomagnetic Reference Field., This research was partially funded by the Italian Programma Nazionale di Ricerche in Antartide (PNRA) and by the Spanish Programa Nacional de Investigación en la Antártida (PNIA, CICYT, Project No. ANT98-0886).