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The current version of the global magnetic model, which supports navigation, dates from 2015 and was expected to last until 2020. But the magnetic field, which protects the Earth from solar winds and cosmic rays, and of which the poles are close The geographical poles of the world are changing very rapidly and scientists announced at the beginning of the year that it would be necessary to anticipate a new revision of the model within a year.
"Due to unexpected variations in the Arctic region, scientists have released a new model to better represent the evolution of the magnetic field from 2015 to today," announced today. National Administration of Oceans and Atmosphere.
In 2018, geomagnetism experts realized that the margin of error of the model was close to exceeding the acceptable limit for navigational errors. Two years ago and after the modernization of the global magnetic model, part of the magnetic field further south temporarily moved to the north of South America and the east of the ocean. Peaceful.
Although the use of the global magnetic model was originally military, it soon began to be used by online navigation systems. The changes made to the users will however be minimal, as CNN Ciaran Beggan, geophysicist of the British Geological Survey in the United Kingdom, explains.
If, between 1900 and 1980, the displacement was about 10 km per year, it has accelerated over the last two decades to reach 38 to 50 km / year.
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