The Laschamp event, also known as the Laschamp excursion, is a period in the Earth's magnetic field history that occurred approximately 41,000 years ago. During this time, the magnetic field weakened significantly, allowing solar wind to penetrate the atmosphere and causing changes in climate and atmospheric chemistry. Some synonyms for the Laschamp event include the Laschamp excursion, the Laschamp geomagnetic reversal, the Laschamp anomaly, and the Laschamp episode. Other related terms include the Brunhes-Matuyama reversal, the Mono Lake excursion, and the Gothenburg magnetic excursion. These events provide valuable insights into the Earth's magnetic field and our planet's history.