The global magnetic field strength dropped by 9%

 A long-existing weak intensity zone in the earth's magnetic field is becoming more and more strange, and may even split into two distinct anomalous areas.


　　South Atlantic Anomaly is an area of ​​the earth's magnetic field located between Africa and South America, covering all areas of southern South America and the South Atlantic Ocean. For at least decades, the magnetic field in this region has become weaker and weaker, and this is part of the global trend. According to data from the European Space Agency (ESA), the global magnetic field strength has dropped by 9% in the past 200 years. The South Atlantic anomaly appears to be a special point of change. Now, satellite detection results for investigating the anomaly area show that in southwest Africa, the geomagnetic intensity is getting weaker, indicating that the South Atlantic anomaly area may split into two separate low-magnetic areas.


　　 The European Space Agency pointed out that this change does not mean that there will be any imminent danger, but it may help reveal the nuclear activities that drive these changes. Currently, the European Space Agency’s satellites are collecting data on electromagnetic fields, hoping to answer this question.


　　 constantly changing area


　　 The normal operation of the compass and the global positioning system (GPS) relies on the earth's magnetic field, and the existence of this magnetic field also protects the earth from the damage of the charged solar particles and prevents these particles from damaging the electrical equipment. Therefore, the fluctuation of the earth's magnetic field is of great significance, but scientists' understanding of this is still very limited. The earth's magnetic field comes from the agitation of the molten iron core, which is like a giant magnet (hence the north and south poles). However, the geomagnetic field is not as uniform as a typical bar magnet, but has areas of varying strength, sometimes even alternating north and south magnetic poles.


　　 At present, the weakening of the geomagnetic field may herald another "geomagnetic reversal", but it may also be a temporary fluctuation. Studies have found that if the geomagnetic field is indeed reversed, that is, the north and south magnetic poles are reversed, the South Atlantic anomaly is likely to be the origin of this change.


　　 The Swarm satellite constellation launched by the European Space Agency in 2013 is detecting this anomaly, looking for small changes that can explain the state of the earth’s core. According to the European Space Agency, since the satellite group entered orbit, the South Atlantic anomaly has formed a second center of weak magnetic intensity. The appearance of this anomalous region indicates that a complex process has taken place in the core of the earth; the agency said in a press release that the dipole and north and south magnetic fields alone cannot explain this change pattern.


　　Mysterious core(https://www.pursesinstyle.org)


"The weakest value newly emerged in the eastern part of the South Atlantic anomaly has appeared in the past ten years and has been developing rapidly in recent years," Jürgen Maitzka, a geomagnetic researcher at the Helmholtz Potsdam Center-German Geoscience Center Matzka) said in a statement, “We are very lucky to be able to put the Swarm satellite into orbit to investigate the development of anomalous areas in the South Atlantic. The challenge now is to understand the processes driving these changes in the Earth’s core.”


　　 According to the European Space Agency, the magnetic field in this area is very weak, sometimes enough to affect satellites passing through the area. After the loss of magnetic field protection, the International Space Station and other low-Earth orbit satellites are sometimes affected by space radiation, causing "single accidents" such as communication interruptions or computer failures. Astronauts sometimes see white light suddenly appear in front of their eyes.


In 2018, former astronaut Terry Virts said in an interview with the BBC: “This is a well-known area with all different types of satellites-not only manned space stations, but also ordinary communication satellites. And other satellites-there will be problems. You will want to pass there as fast as possible, whether it's to the moon, or to wherever you want to go."

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