An ancient African ritual could be the key to research that shows that the earth's magnetic field is rapidly weakening.
From Chile to Zimbabwe lies the South Atlantic Anomaly, which, according to the researchers, has an extremely magnetic field. The additional radition in the area could even disrupt the electronics.
In the Limpopo River Valley in southern Africa, there was a group of Bantu people who lived about 1,000 years ago. They had a ritual of burning mud huts and grain baskets during periods of drought. The goal was to get the rain going again.
"When you burn clay at very high temperatures, you actually stabilize the magnetic minerals, and when they cool off from these very high temperatures, they anchor the earth's magnetic field." Geophysicist John Tarduno said.
It turned out they were concentrating on something they did not even know at the time.
"We found evidence that these anomalies have occurred in the past, and this helps us to put current changes in the magnetic field into context," Tarduno said.
What do we do with this information?
"We are stronger evidence that there is something uncommon at the core-mantle border under Africa that could have a significant impact on the global magnetic field," Tarduno said. Tarduno said.
The weakening means that we are more susceptible to solar wind and cosmic rays, and it could even cause the magnetic pole of the earth to reverse.
Do not fall out because it happened before.
The research results published in the Geophysical Review Letters show that we find ourselves in the midst of a "rapid decay that best expresses itself through a deeper, lower-field area called South Atlanti c Anomaly is referred to "
]" But we know little about the history of the SAA and limit our ability to put current change into a long-term context, "the study said. "Here we present a new magnetic record of sites in southern Africa."
"The new record underpins our earlier conclusions that the SAA is just the latest manifestation of a recurring phenomenon at the core of Africa – that is, river discharge. This has a profound impact on the expression of the geomagnetic field.
According to the research, decay has occurred in the last two centuries.
By modeling the different scenarios more, the researchers believe how long they can show. These episodes of magnetic shifts last, but they focus mainly on this one region that could reveal more about the entire planet.