Study recommends Earth Defense Magnetic Shield that failed 42,000 years later

According to a study of carbon isotopes preserved in ancient trees, the value of several centuries of climate change, many eliminations, and even changes in human behavior can be directly linked to the last time of change. Earth’s magnetic range to polarity.

“The findings were made possible by old kauri trees from New Zealand, which have been preserved in sediments for more than 40,000 years. Using the old trees we could measure, and head the spike in atmospheric radiocarbon levels caused by the collapse of the Earth ‘s magnetic field. “explains geologist and author Chris Turney of the University of New South Wales in Australia.

The Earth’s magnetic field protects the surface from harmful radiation and energetic particles. When this radiation enters the atmosphere, it interacts with the local nitrogen atoms to produce a nuclear reaction that produces the slightly radioactive isotope carbon -14, and which is finally introduced into the living kauri trees. High concentrations of carbon-14 in fossil wood samples suggest a weak magnetic field, as more radiation passes through the atmosphere to produce more carbon-14. By analyzing the annual tree rings, the researchers reconstructed the carbon-14 curve for more than 40,000 years.

The last complete geomagnetic revolution occurred about 780,000 years ago. The latest change in the Earth’s magnetic field is called the Laschamp event, named after the lava flow in France where it was first identified, and this is what scientists call a geomagnetic journey, when the magnetic fields weaken, but do not return polarity. . This happened about 41,000 years ago, and lasted about 800 years. Based on their measurements, scientists had previously been able to determine that the Earth’s magnetic field had weakened to about 28 percent of its normal strength during the Laschamp event.

The new study shows that Laschamp’s previous event was preceded by another, even more important, event when the Earth’s magnetic field fell to just 0-6 percent strength, about 42,000 years ago. Researchers named it “Adams’ Interim Geomagnetic Event”, or “Adams Event” for a short time – a tribute to science fiction writer Douglas Adams.

The effects on the Earth’s environment at the Adams Event are not yet clear; however, the authors suggest that the extinct field could induce significant changes in the ozone cover of the Earth’s atmosphere, leading to potentially harmful ultraviolet radiation. reaching the Earth’s surface and disrupting weather patterns around the world.

The researchers compared their results with records from sites across the Pacific Ocean and used it in modeling global climate, finding that the growth of ice sheets and glaciers is over. North America and major movements in major wind zones and tropical storm systems coincide with the proposed tape for Earth. protective shield around 41-42,000 years ago.

The researchers also suggest that the Adams Event altered human behavior as recorded in some of the oldest known cave paintings to date, created nearly 42,000 years ago.

“This sudden behavioral shift in very different parts of the world is consistent with the use or change in caves at the Adams Event, possibly as a refuge from ultraviolet B elevation, which may be to levels harmful, during minso grandsolar or energetic solar particles, which may also explain increased use of och red sunlight, ”they wrote in their paper.

Some authors also associate major boundaries with variables in the Earth’s magnetic field. About 40,000 years ago, mammal fossils in Australia and Eurasia record significant deaths of large mammals that included Neanderthals in Europe.

Other authors are diagree, concluding that there appears to be no link between magnetic conversion and extinction levels. Even at the time of complete inversion, the magnetic field does not disappear completely. Residual magnetism still offers some protection and the Earth’s atmosphere by itself is enough to protect life from the most harmful effects of radiation.