The South Atlantic Anomaly (SAA), a region of weakened Earth's magnetic field, poses a risk to satellites and spacecraft. NASA is tracking the anomaly to mitigate these hazards and investigate this complex phenomenon.
The space agency's satellites and spacecraft are particularly vulnerable to the weakened magnetic field strength within the South Atlantic Anomaly (SAA), and the resulting exposure to charged particles from the Sun.
This 'dent' in Earth's magnetic field, or a kind of 'pothole in space' – generally doesn't affect life on Earth, but the same can't be said for orbital spacecraft (including the International Space Station), which pass directly through the anomaly as they loop around the planet at low-Earth orbit altitudes. During these encounters, the reduced magnetic field strength inside the anomaly means technological systems onboard satellites can short-circuit and malfunction if they become struck by high-energy protons emanating from the Sun. These random hits may usually only produce low-level glitches, but they do carry the risk of causing significant data loss, or even permanent damage to key components – threats obliging satellite operators to routinely shut down spacecraft systems before spacecraft enter the anomaly zone. Mitigating those hazards in space is one reason NASA is tracking the SAA; another is that the mystery of the anomaly represents a great opportunity to investigate a complex and difficult-to-understand phenomenon, and NASA's broad resources and research groups are uniquely well-appointed to study the occurrence. 'The magnetic field is actually a superposition of fields from many current sources,' geophysicist Terry Sabaka from NASA's Goddard Space Flight Centre in Greenbelt, Maryland said. The movement of that mass generates electrical currents that create Earth's magnetic field, but not necessarily uniformly, it seems. A particularly large region of the field, located about 2,900 kilometers (1,800 miles) below the African continent, is thought to disturb the field's generation, resulting in the dramatic weakening effect – which is aided by the tilt of the planet's magnetic axis
South Atlantic Anomaly Magnetic Field Spacecraft Satellites NASA
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