The magnetic field is a fundamental property of the Earth as well as of many other planetary bodies, that is an imprint of different physical processes. Studies of the magnetic field can provide insights to the dynamo processes that generate different parts of the field, like in the Earth core, oceans, in the ionosphere and magnetosphere. Furthermore, its presence may allow inferences upon electrical mantle conductivity and the history of planetary surfaces.

Earth's magnetic field is directly recorded by geomagnetic
observatories and satellite missions, which may allow a precise
modelling of its spatial structure and temporal behaviour; from months to centuries. On the contrary, geomagnetic field variations throughout Earth's history can be indirectly observed by analysing the remanent magnetization in sediments, archaeological artefacts and volcanic rocks. Their study provide insights to magnetic field reversals and excursions, and in combination with direct measurements of the geomagnetic field may allow a comprehensive view on the dynamical behaviour of Earth's magnetic field.

In the last few years studies and measurements of the magnetic field around other celestial bodies suggested that different types of magnetic fields to exist in the solar system. These findings are facilitated by a fleet of space probes which
carry sophisticated instrumentation to allow detailed studies of magnetic fields generated inside those bodies, but also
interactions of their magnetospheric environment with the
interplanetary magnetic field of solar origin. This session wishes to promote all efforts towards this direction. We solicit contributions that develop, introduce and employ innovative methodologies in the study of the Earth’s magnetic field in terms of any of its sources. Bearing in mind that the same methodologies can often be applied for the study of different planets and moons, we also welcome contributions dealing with the magnetic field of other bodies in our solar system. Hereby, we hope to promote mutually beneficial exchanges between the geomagnetism and the planetary communities.