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Earth’s magnetic field once weakened dramatically and briefly reversed—and scientists have now turned that ancient event into an eerie soundscape.

The event, known as the Laschamp excursion, happened roughly 41,000 years ago. At its weakest point, Earth’s magnetic field may have fallen to only about 5% of its present strength, allowing substantially more cosmic radiation to reach the atmosphere.

Scientists reconstructed how the magnetic field changed using geological evidence together with measurements from ESA’s Swarm satellite mission. They then converted those changing magnetic patterns into sound.

What you hear is not a literal recording from 41,000 years ago. Researchers used the scientific data to control and transform recordings of natural sounds, including creaking wood and falling rocks, essentially turning changes in Earth’s magnetic field into a musical score.

Earth’s magnetic field is generated largely by the movement of electrically conducting liquid iron in the planet’s outer core. It forms a protective magnetic environment that helps shield Earth from charged particles coming from the Sun and space.

Magnetic reversals and excursions have happened naturally throughout Earth’s history. Scientists continue monitoring the field today, but changes such as the drifting magnetic poles or the weakening South Atlantic Anomaly do not by themselves mean another reversal is imminent.

The unsettling audio gives us something unusual: a way to experience an invisible planetary process that happened tens of thousands of years before humans had any instruments capable of measuring it.

Source: European Space Agency; GFZ German Research Centre for Geosciences; Technical University of Denmark