Magnetic field: learning more with Swarm

To learn more about Earth's magnetic field, the three Swarm satellites were launched on 22 November. Like 3D compasses, they are measuring the strength and direction of the magnetic field.

This is the third of three videos:
Magnetic field: an introduction: http://www.youtube.com/watch?v=P7nhgX0ppek
Magnetic field: why it matters: http://youtu.be/6vYzVdSxjUs
Magnetic field: learning more with Swarm

More about Swarm: www.esa.int/swarm