Sources of the Earth's magnetic field

The dominant  main field originates in the Earth's fluid core. The second internal contribution comes from magnetized rocks in the lithosphere. The third contribution, varying rapidly in time, comes from outside the Earth (External field). Amongst the sources which contribute to the geomagnetic field, the oceanic magnetic field is the most faintest.

A detailed description can be found here.

The Geomagnetic Core Field

The dominant component is the so-called main field, generated by a hydrodynamic dynamo operating in the Earth's fluid core.

The Magnetic Field of the Lithosphere

The second internal contribution of the Earth's magnetic field comes from the Earth's lithosphere, induced from magnetised rocks.

External Magnetic Fields

The third contribution, often varying rapidly in time, comes from outside the Earth, from current systems in the ionosphere and magnetosphere, driven by the activity of the Sun.

The oceanic magnetic fields

Amongst the many sources which contribute to the geomagnetic field the magnetic field generation due to ocean circulation is the most faintest.

Contact

Profile photo of  Prof. Dr. Claudia Stolle

Prof. Dr. Claudia Stolle
Geomagnetism

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