Grim Reaper 6 Posted September 16, 2021 #1 Share Posted September 16, 2021 ""The findings of a new study by the University of Liverpool provides further evidence of an approximately 200 million-year long cycle in the strength of the Earth’s magnetic field.""They found that between 332 and 416 million years ago, the strength of the geomagnetic field preserved in these rocks was less than quarter of what it is today, and similar to a previously identified period of low magnetic field strength that started around 120 million years ago.""The researchers have coined this period “the Mid-Palaeozoic Dipole low (MPDL).” ""A weak field also has implications for life on our planet. A recent study has suggested that the Devonian-Carboniferous mass extinction is linked to elevated UV-B levels, around the same as the weakest field measurements from the MPDL."" https://scitechdaily.com/new-evidence-of-200-million-year-cycle-for-earths-magnetic-field/ Link to comment Share on other sites More sharing options...
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