How Earth's magnetic field is changing

The European Space Agency (ESA) launched its trio of Earth-facing satellites – the Swarm satellites – more than two years ago. Since then, the three probes have been tirelessly making measurements of the Earth's magnetic field, mapping it out in detail. Now, that data has been used in a new study of how the magnetic field has changed over recent years, with the results echoing what's happening at the planet's core. 









Read More: http://www.gizmag.com/esa-swarm-earth-magnetic-field-changes/43249/