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The study shows that the Earth almost lost its magnetic field 565 million years ago.



The study shows that the Earth almost lost its magnetic field 565 million years ago.

If you thought you had a bad day, think again: the Earth almost lost its magnetic field 565 million years ago. But this can be saved by a geodynamic phenomenon according to a new study.

A study published in the journal Nature Geoscience shows that the core of the Earth, which was still young and liquid at the time, began to strengthen, which in turn strengthened the magnetic field and prevented the solar wind from entering the Earth. and radiation that prevails in abundance in space.

“Together with 14 other directional data sets that suggest the hyper-inversion frequency, these unusually low field strength values ​​suggest anomalous field behavior, which is consistent with the predictions of geodynamic modeling, high thermal conductivity and age of the Ediacaran period. the growth of the inner core ", the researchers wrote in the study.

Researchers observed plagioclase and clinopyroxene samples from eastern Quebec, Canada, and found that they contain magnetic needles ranging in size from 50 to 100 nanometers, which is surprising to the researchers.

“These tiny magnetic particles are ideal magnetic recorders,” said study co-author John Tarduno in an interview with LiveScience. “When they cool down, they block the recording of the Earth’s magnetic field, which lasts for billions of years.”

They could determine that the particles inside the crystals have a very low charge, Tarduno added, noting that the Earth is at a "critical point where the dynamo has almost completely collapsed."

When geodynamics, which causes the growth and maintenance of a magnetic field, had a well-known beginning from hardening the core of the Earth, the charged particles continued to move, and the magnetic field increased.


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