NASA says Earth’s magnetic field weakening, splitting into two lobes

"A small but evolving dent in Earth’s magnetic field can cause big headaches for satellites"

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Researchers at the National Aeronautics Space Administration have been tracking a slow-moving anomalous dent in the Earth’s magnetic field over South America that is now splitting into two lobes and is expected to pose major challenges for orbiting satellites and GPS systems.

“Earth’s magnetic field acts like a protective shield around the planet, repelling and trapping charged particles from the Sun. But over South America and the southern Atlantic Ocean, an unusually weak spot in the field – called the South Atlantic Anomaly, or SAA – allows these particles to dip closer to the surface than normal. Particle radiation in this region can knock out onboard computers and interfere with the data collection of satellites that pass through it – a key reason why NASA scientists want to track and study the anomaly.” NASA reported on Monday. “The South Atlantic Anomaly is also of interest to NASA’s Earth scientists who monitor the changes in magnetic field strength there, both for how such changes affect Earth’s atmosphere and as an indicator of what’s happening to Earth’s magnetic fields, deep inside the globe.”

NASA reports as of Monday that the SAA is not creating any adverse effects on life on the planet. However, that may just be because the data is missing or the overall verdict is not yet in.

“Currently, the SAA creates no visible impacts on daily life on the surface. However, recent observations and forecasts show that the region is expanding westward and continuing to weaken in intensity. It is also splitting – recent data shows the anomaly’s valley, or region of minimum field strength, has split into two lobes, creating additional challenges for satellite missions.”

— NASA

H/T: @niallr93 on Twitter

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