Scientists reveal sounds from Earth's magnetic field reversal 40,000 years ago

Scientists have released sounds from around 40,000 years ago, during the Laschamps event when Earth's magnetic field briefly reversed. This event weakened the magnetic field to just 5% of its current strength, allowing more cosmic rays to enter the atmosphere. The sounds, created using data from the European Space Agency's Swarm mission, include natural noises like wood creaking and rocks falling. Researchers found increased levels of beryllium-10, an isotope linked to cosmic rays, in ice cores and marine sediments from that time. The magnetic field reversal lasted about 440 years and may have influenced climate changes and human behavior. Current anomalies in Earth's magnetic field do not indicate an impending reversal. The Swarm mission has been monitoring these fluctuations since 2013.