Sources of the Earth's magnetic field

The dominant geomagnetic core field is generated in the Earth fluid outer core. The second part ist contributed by magnetized lithospheric rocks. A further contribution with a high temporal variety originates from sources outside of the Earth (Externel Field). Probably the most faintest contribution to the Earth's magnetic field, is generated by oceanic circulations.

Geomagnetic long term variations

Reconstructions of the global geomagnetic field on historical and longer time scales shows longperiodic variations. It is important to know the secular variation of the field on all time scales in order to better understand the dynamics of the Earth's core, the geodynamo processes and long-term variations in shielding against solar wind and cosmic radiation.

Ionosphere and Upper Atmosphere

The ionosphere is the ionised part of the upper atmosphere, which builds up through absorption of solar electromagnetic and particle radiation. Electric currents in the ionosphere produce signatures in the Earth’s magnetic field, both during geomagnetically quiet and disturbed times. We investigate different topics that relate to the interaction between the upper atmosphere, the magnetic field, and the solar radiation.

Geomagnetic Observatories

Globally distributed geomagnetic observatories deliver high-quality, continuous measurements of the Earth’s magnetic field. They give knowledge on changes occurring in the Earth’s core as well as in near-Earth space and they facilitate the best possible interpretation of satellite-borne magnetic measurements. Real time data are an important tool for the monitoring of acute space weather incidents. GFZ’s global network of geomagnetic observatories and associated cooperation programmes are operated from the Niemegk observatory.

Geomagnetic Perturbations


Profile photo of  Prof. Dr. Claudia Stolle

Prof. Dr. Claudia Stolle

Behlertstraße 3a
Building K 3, room 006
14467 Potsdam
tel. +49 331 288-1230