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Complete magnetic pole reversal a major global environmental crisis 41,000 years ago

Manwon Lender

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The Laschamp event was a short reversal of the Earth’s magnetic field. It occurred 41000 years ago during the ice age. The period of reversed magnetic field was 440 years, with the transition from the normal field lasting 250 years. The reversed field was 75% weaker whereas the strength dropped to only 5% of the current strength during the transition. This resulted in greater radiation reaching the Earth, causing greater production of beryllium 10. Geomagnetic Excursions / Laschamp Event | Pole Shifts

A flip-flop of Earth’s magnetic poles between 42,000 and 41,000 years ago briefly but dramatically shrank the magnetic field’s strength — and may have triggered a cascade of environmental crises on Earth, a new study suggests.

Surprisingly, the most intense effects did not occur during the actual pole reversal, the team found, but in the several hundred years leading up to it, spanning about 42,300 to 41,600 years ago. During the actual reversal, the field was only about 28 percent as strong as it is today. But during that transitional period, field strength shrank to about 6 percent of its current strength.

A magnetic field reversal 42,000 years ago may have contributed to mass extinctions: Magnetic field reversal may have contributed to mass extinctions | Science News

Scientists Bring Global Pole Shift Fears Into Focus

Scientists have published a paper revealing the catastrophic effects of a “Laschamps excursion” around 42,000-years-ago. A Lascah-what? A “Laschamps excursion” is better known in today’s vocabulary as a pole shift event. The “Cataclysmic Pole-Shift Hypothesis” is largely regarded as a fringe theory about a shifting of the relative positions of the Earth’s geographic poles. The results of pole shifts are often presented in popular culture as great tectonic events that spark global calamities such as floods and landslides.

However, now, a new scientific study suggests that the last time the Earth’s magnetic field “flipped around, then flopped back again,” the effects on Earth’s surface were just like how literature and the movies portray pole shifts.

Scientists generally agree that any such changes in the magnetic field today, including reversals, “probably don’t pose a threat to life.” The main modern threat is our electronic infrastructure on Earth and in the sky. This is because space weather events such as geomagnetic storms, arising from the interaction between the magnetic field and incoming solar radiation, could seriously disrupt satellite communications, GPS and power grids. And while our lives might not be washed away in floods this is a troubling prospect when we consider the economic cost of a collapse of the US power grid due to a space weather event has been estimated at “around one trillion dollars.” And the pole shift threat is deemed serious enough in the UK that it is regarded as a high priority on the national risk register.  

Scientists Bring Global Pole Shift Fears Into Focus | Ancient Origins (ancient-origins.net)



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