Hear the Ancient Flip: Earth's Magnetic Reversal Revealed

Scientists recreated the sound of Earth's 41,000-year-old magnetic reversal (the Laschamps excursion) using ESA Swarm data and ancient records, showing the field weakened to about 5% of its normal strength for centuries before flipping orientation for around 440 years and then staying far weaker than today. The event aligns with climate signals and megafauna extinctions and even ancient cave art, while today the field is weakening again with the North Pole drifting and the South Atlantic Anomaly expanding. Researchers caution that another reversal is not imminent, but ongoing monitoring of geomagnetic changes and space weather is essential.