The ancient magnetic field of the Earth finally explained?
The magnetic field of the earth is caused by the growth of the solid inner core. However, it has only been around 1 billion years. So why the early magnetic field dating back to at least 3.45 billion years? Theoretical predictions exist, but for the first time, researchers have conducted experiments that confirm. This work, conducted by an international team of researchers from the Institut de Physique du Globe de Paris (IPGP: CNRS / IPGP / Université Paris Diderot), members of the group UnivEarthS “From dust to planets” and the University of California Santa Cruz, were recently published in the journal Nature.
An early geodynamo driven by exsolution of mantle components from Earth’s core,
James Badro, Julien Siebert & Francis Nimmo,
Nature 536, 326–328 (18 August 2016) – doi:10.1038/nature18594
James Badro, Institut de physique du globe de Paris (IPGP : CNRS / IPGP / Université Paris Diderot)
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Source : Actualités du CNRS-INSU http://www.insu.cnrs.fr/node/5975