South Atlantic Anomaly
Researchers exploring an abnormality in Earth’s magnetic field occurs in the southern hemisphere that has been named the ‘South Atlantic Anomaly (SAA)’. Researchers from University of Rochester gathered a data from southern Africa areas to extend their record of earth’s magnetic field back thousands of years to the first millennium.
According to researchers, this data explains the ongoing changes in the magnetic field certainly occur in Southern Hemisphere areas. Also, explains a region in southern Africa may assume a unique role in magnetic pole reversals.
We know, the science of earth magnetic field that protects the planet from harmful radiation from space. Almost 800,000 years back, the poles switched from north pointed south and vice versa.
But, from the past 160 years, the strength of the magnetic field decreasing at a disturbing rate. Researchers reveal the weakest region of Chile to Zimbabwe called the South Atlantic Anomaly. The South Atlantic Anomaly region affects the entire globe.
Earth’s magnetic field getting weak
In this region, the magnetic field has weakened in periods of 400-450 AD, 700-750 AD, and again 1225-1550 AD.
A seismological data uncovered a region far below southern Africa called the African Large Low Shear Velocity Province. The region is located between outer core and the mantle. Sitting on top of the liquid outer core, it may sink slightly, disturbing the stream of iron and eventually affecting the Earth’s magnetic field.
While, the changes in the magnetic field would have wide-reaching effects. The changes in the magnetic field could cause electrical grid failures, navigation system malfunctions, and satellite breakdowns. A weakening of the magnetic field might also produce harmful radiation reaches Earth and trigger an increase in the incidence of skin cancer.
Researchers say, the research data does not really indicate a complete pole reversal. We show this behavior has occurred at least a couple of times before the past 160 years and is part of a bigger long-term pattern. In any case, it’s just too soon to state for certain whether this conduct will prompt a full pole reversal.
The possibility of a continued decay in the strength of the magnetic field is a societal concern that benefits continued study and monitoring.