Earth's magnetic field is weakening

Satellite data from the European Space Agency have revealed that the Earth's magnetic poles are weakening, and doing so faster than scientists previously thought.

From Mysterious Universe:

Chris Finlay, one of the researchers with the ESA, says that this new data is groundbreaking in terms of how much it reveals about Earth's magnetic field: "Swarm data are now enabling us to map detailed changes in Earth's magnetic field, not just at Earth's surface but also down at the edge of its source region in the core. Unexpectedly, we are finding rapid localized field changes that seem to be a result of accelerations of liquid metal flowing within the core."

From ESA:

Although invisible, the magnetic field and electric currents in and around Earth generate complex forces that have immeasurable effects on our everyday lives.

The field can be thought of as a huge bubble, protecting us from cosmic radiation and electrically charged atomic particles that bombard Earth in solar winds. However, it is in a permanent state of flux.