7/27/2023 0 Comments South atlantic anomaly![]() ![]() Even though unlike global warming or any weather change, this anomaly doesn’t directly impact human lives, it could actually bring on a change in the way we access technology.The magnetic shield has an important role to play in keeping unwanted radiation away as well as helping determine the location of magnetic poles.This area has grown and moved westward at a rate of around 20 km per year.The study conducted between 19, said that the magnetic field weakened considerably in a large region stretching from Africa to South America, known as the ‘SAA’.The weakening of the magnetic field is also causing technical difficulties for the satellites and spacecraft orbiting the planet.A large and rapid shrink has been observed in the SAA region over the past 50 years just as the area itself has grown and moved westward.Over the last 200 years, the magnetic field has lost around 9% of its strength on a global average.The SAA is the near-Earth region where the Earth’s magnetic field is weakest relative to an idealized Earth-centered dipole field.The effect is caused by the non-concentricity of the Earth and its magnetic dipole.This leads to an increased flux of energetic particles in this region and exposes orbiting satellites to higher-than-usual levels of radiation.The SAA is an area where the Earth’s inner Van Allen radiation belt comes closest to the Earth’s surface, dipping down to an altitude of 200 kilometres.The SAA is referred to the behaviour of Earth’s Geo-Magnetic field in an area between Africa and South America.New data obtained by the European Space Agency (ESA) Swarm satellites has revealed the existence of a mysterious anomaly weakening the Earth’s magnetic field.m^2 ) is not so low when compared with recent paleomagnetic data for the Holocene (last 12ka) and for the entire Brunhes geomagnetic normal polarity (last ∼0.8Ma), although the rate of decay is similar to that given by previous documented geomagnetic reversals or excursions. ![]() However, the current value of the dipolar moment (7.7 10^22 A The presence of the reversal patches at the CMB seems to be characteristic during the preparation phase of a geomagnetic transition. In addition, we demonstrate that the quadrupole field mainly controls this reversal patch along with the rapid decay of the dipolar field. Our results reveal that one of the reversed polarity patch located at the CMB under the South Atlantic Ocean is growing with a pronounced rate of −2.54♱05 nT per century and with western drift. In this paper we carry out a detailed study about this issue using the most recent models that also include data from the last ESA mission Swarm. Several studies associate this anomaly as an indicator of an upcoming geomagnetic transition, such an excursion or reversal. Its extent area at the Earth’s surface is continuously growing since the intensity instrumental measurements are available covering part of the Southern Hemisphere and centered in South America. The South Atlantic Anomaly is nowadays one of the most important features of the Earth’s magnetic field. The South Atlantic Anomaly: The Key for a Possible Geomagnetic Reversal ![]()
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