They Discover ‘Strange Signals’ Coming From Earth’s Core – Mystery Science

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  They Discover ‘Strange Signals’ Coming From Earth’s Core – Mystery Science

A team of French scientists has discovered strange “signals” in the Earth’s core, which repeat themselves every seven years.



For more than 20 years, Nicolas Gilletfrom the University of Grenoble Alpes in France, and his colleagues looked at data analyzing the Earth’s magnetic field.



The researchers found that the magnetic field of our planet it fluctuates like clockwork every seven years, moving west at 1,500 kilometers per hour around the equatorial region of the core. Satellites that continuously monitored the geomagnetic field allowed them to look for small, or year-to-year changes that had not previously been detected.



These interannual changes have remained unexplained since their discovery in the late 1970s in ground records. Understanding them opens a door into the realm deep within the core.



“By recording the Earth’s magnetic field using satellites, we can get images of what is happening more than 3,000 meters below our feet,” Gillet said.



Researchers are trying to understand the physics responsible for the evolution of magnetic field of our planet. As explained Gillet the magnetic field “evolves on all time scales, with the longest periods showing the strongest changes. What we are discussing here are small fluctuations.



They Discover ‘Strange Signals’ Coming From Earth’s Core – Mystery ScienceIllustrative image of the iron core at the center of the Earth.



Previously, the family of waves responsible for the oscillation were believed to operate on much longer time scales, centuries to millennia, for observable field variations.



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The discovery leads to a better understanding of geomagnetic signals in the Earth’s core, allowing a clearer idea of ​​the physical characteristics of the core and the magnetic field. It also rules out the idea that there is a stratified layer above the Earth’s core.



Therefore, it tells us that there is still a lot to learn about the inner workings of the Earth.



The research was published in the journal Proceedings of the National Academy of Sciences.





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