It turns out that the earth's magnetic field is weakening
by
The European Space Agency (ESA) reported that ' geomagnetism is weakening in the Southern Hemisphere from Africa to South America.'
ESA-Swarm probes weakening of Earth's magnetic field
https://www.esa.int/Applications/Observing_the_Earth/Swarm/Swarm_probes_weakening_of_Earth_s_magnetic_field
Geomagnetism is essential for living creatures on the ground because it prevents the diffusion of the earth's atmosphere and water into outer space and reduces cosmic rays and ultraviolet rays that fall from the sun. There are various opinions about 'how the geomagnetism is generated', but ESA supports the theory that 'it is created by the convection of liquid iron that forms the outer core of 3000 km underground'.
However, it has become clear that such geomagnetism is weakening and its shape is changing. According to ESA, the earth's global magnetism has weakened by an average of 9% in the last 200 years. Especially in the ' South Atlantic Anomaly Zone ', which is a region with particularly weak geomagnetism that exists from Africa to South Africa, the geomagnetic field seems to be significantly reduced.
ESA has also released a movie that shows the changes in geomagnetism in an easy-to-understand manner. In the following movies, the strength of the earth's magnetism is represented by 'color', red means strong earth magnetism and blue means weak earth magnetism. The South Atlantic Anomaly Zone is a region with a deep blue color and extremely weak geomagnetism, centered on Paraguay in South America.
South Atlantic Anomaly impact radiation-YouTube
The white dots on the map are the locations where the satellite ' Swarm ' observed the geomagnetism. The state of the geomagnetism on April 1, 2014 at the beginning of the movie is like this.
The state of geomagnetism on August 13, 2019, five years later is as follows. The blue areas in the South Atlantic Anomaly Zone are wide and dark, visually demonstrating weakened geomagnetism.
According to ESA, the geomagnetism of the South Atlantic Anomaly Zone declined from about 24,000 nanotesla to about 22,000 nanotesla from 1970 to 2020, and the South Atlantic Anomaly Zone itself moved west at a pace of about 20 km per year. That. In addition, there is a 'second center' in the circular South Atlantic Anomaly Zone, and there are signs that it will split into two.
In the history of the earth, the phenomenon that 'geomagnetism moves' is actually common. Since it is thought that a phenomenon called ' geomagnetic reversal ' in which the North Pole and the South Pole are swapped every 250,000 years, the ESA notes that the South Atlantic Anomaly Zone this time is 'within common sense.'
ESA skips Swarm and continues to study geomagnetic changes. 'The second center of the South Atlantic Anomaly Zone occurred about 10 years ago and has been actively developing in recent years. Swarm in orbit to investigate the evolution of this phenomenon.' The existence of is really encouraging. We are now working on the processes in the inner core that are producing the changes in geomagnetism. '
Related Posts:
