Magnetic field measurements made with the Danish Ørsted Satellite (1999 – 2014), the German CHAMP satellite (2000 – 2010) and the three Swarm satellites (since 2013) have led to the most detailed models of the Earth's magnetic fields and its time change.
However, the greatest limitation for the accuracy of the models is not due to the precision of the instruments, but to the presence of electrical currents in the earth environment.
In the lecture I will talk about measuring the Earth's magnetic field with satellites, using the raw measurements to separate the various contributions from the Earth's interior (core and crust) as well as its surrounding (ionosphere and magnetosphere) and how the results are interpreted .
