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.

Earth’s magnetic field might be invisible, but it’s complex and ever-changing, protecting us from cosmic radiation and solar winds. Since launching at the tail end of 2013, ESA’s Swarm satellites have been studying the different magnetic signals from the planet’s core, mantle, crust, oceans, all the way out to the ionosphere and magnetosphere. READ MORE