During the last decades, the geomagnetic community has developed and tuned up novel physic-mathematical approaches to analyse in details the Earth’s magnetic field. Among these techniques, some have been modified and optimized to be applied to the different geomagnetic data, as the case of instrumental (from observatories, repeat stations, satellites) or palaeomagnetic data, extracting the most useful information from these data. These analyses are fundamental to describe the spatial and temporal variations of the geomagnetic field and to separate the internal and external contributions which allow us to have a better understanding of the dynamo process in the outer core.
This session will provide a current status about the geomagnetic field modelling at regional or global scales and its secular variation in the complete time spectrum: from geomagnetic jerks to long-term variations, gained not only from the analysis of geomagnetic data but also of other kinds of geophysical data. Studies aiming at a better identification of the geomagnetic internal contribution from observations are also welcome.