This session covers all methods and scales used for registering, processing and understanding of magnetic field from the core to the above crustal anomalies and corresponding deep or shallow sources: from satellite missions to oceanic profiles and detailed ground based arrays, and from mathematical processing to petrophysical and geological ground evidence. Presentations on compilation methods of heterogenous data sets, useful definitions of magnetic field changes, for scientific Earth's interior studies or natural resources exploration purposes, as well as studies of eventual temporal anomaly changes are also encouraged. Cases of geomagnetic applications in exploration and geological interpretation of magnetic anomalies, jointly with other geodata are warmly welcome.