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Earth's Magnetic Field Flipped 42,000 Years Ago. The Consequences Were Dramatic

19 FEBRUARY 2021
A global period of upheaval 42,000 years ago was the result of a reversal in Earth s magnetic field, new research has found.
According to radiocarbon preserved in ancient tree rings, several centuries worth of climate breakdown, mass extinctions, and even changes in human behaviour can be directly linked to the last time Earth s magnetic field changed its polarity.

The research team has named the period the Adams Transitional Geomagnetic Event, or Adams Event, after sci-fi writer Douglas Adams, who famously declared the number 42 the ultimate answer to life, the Universe, and everything.
For the first time ever, we have been able to precisely date the timing and environmental impacts of the last magnetic pole switch, said Earth scientist Chris Turney of the University of New South Wales in Australia. ....

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Magnetic reversal 42,000 years ago triggered climate change

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But according to the team s findings, the most dramatic part was the lead-up to the reversal, when the poles were migrating across the Earth.
Earth s magnetic field dropped to only 0 to 6 per cent strength during the Adams Event, said Professor Turney.
We essentially had no magnetic field at all – our cosmic radiation shield was totally gone.
During the magnetic field breakdown, the Sun experienced several grand solar minima (GSM) – long-term periods of quiet solar activity.
Even though a GSM means less activity on the Sun s surface, the weakening of its magnetic field can mean more space weather – like solar flares and galactic cosmic rays – could head Earth s way. ....

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Science and Research – Ancient kauri trees reveal a turning point in Earth's history 42,000 years ago – NIWA

Science and Research – Ancient kauri trees reveal a turning point in Earth's history 42,000 years ago – NIWA
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Ancient relic points to a turning point in Earth's history 42,000 years ago

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IMAGE: Using an ancient kauri tree log from Ngāwhā, New Zealand, scientists have dated the timing and environmental impacts of the last magnetic pole switch.
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Credit: Nelson Parker (www.nelsonskaihukauri.co.nz)
The temporary breakdown of Earth s magnetic field 42,000 years ago sparked major climate shifts that led to global environmental change and mass extinctions, a new international study co-led by UNSW Sydney and the South Australian Museum shows.
This dramatic turning point in Earth s history - laced with electrical storms, widespread auroras, and cosmic radiation - was triggered by the reversal of Earth s magnetic poles and changing solar winds. ....

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Ancient Kauri Trees Reveal A Turning Point In Earth's History 42,000 Years Ago

Friday, 19 February 2021, 8:29 am
A new international study using ancient swamp kauri from
Northland shows a temporary breakdown of Earth’s magnetic
field 42,000 years ago sparked major climate shifts leading
to global environmental change and mass
extinctions.
This dramatic turning point in Earth’s
history was triggered by a reversal of Earth’s magnetic
poles and changing solar winds.
Study authors from
UNSW Sydney, the South Australian Museum, NIWA and the
University of Waikato, dubbed this episode the ‘Adams
Transitional Geomagnetic Event’, or ‘Adams Event’ for
short - a tribute to science fiction writer Douglas Adams,
who wrote in The Hitchhikers Guide to the Galaxy that ....

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