LOPES SIQUEIRA, FILLIPE CLAUDIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2012-03-29)
The Earth magnetic field varies in a broad temporal scale, from milliseconds to millions of years. The field we measure at the surface results from the combination between different sources in the ionosphere, magnetosphere ...