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The South Atlantic Anomaly (SAA) is an area where Earth's inner Van Allen radiation belt comes closest to Earth's surface, dipping down to an altitude of 200 kilometres (120 mi). This leads to an increased flux of energetic particles in this region and exposes orbiting satellites (including the ISS ) to higher-than-usual levels of ionizing ...
Operation Argus was a series of United States low-yield, high-altitude nuclear weapons tests and missile tests secretly conducted from 27 August to 9 September 1958 over the South Atlantic Ocean.
Unfortunately, the X-17's limited altitude capability meant it could not reach the required altitude to hit mirror points in the South Pacific over the testing grounds. The only area that had a field low enough for the X-17 to hit easily was the South Atlantic Anomaly, where the Van Allen Belt descends as low as 200 kilometers (660,000 ft). [20]
In October 1984, a National Intelligence Estimate on the South African nuclear program noted: There is still considerable disagreement within the Intelligence Community as to whether the flash in the South Atlantic detected by a US [redacted] satellite in September 1979 was a nuclear test, and if so, by South Africa. If the latter, the need for ...
South Atlantic Anomaly, a magnetic anomaly in the South Atlantic Ocean; Science and technology. Computing. Service Assurance Agent, used for Network Management;
Mean anomaly, a measure of time in the study of orbital dynamics; Pioneer anomaly, the observed deviation of the trajectories of some uncrewed space probes, and especially Pioneer 10 and Pioneer 11; South Atlantic Anomaly, an area where the Earth's inner Van Allen radiation belt comes closest to the Earth's surface
Several hypotheses have been proposed for the origin and persistence of LLSVPs, depending on whether the provinces represent purely thermal unconformities (i.e. are isochemical in nature, of the same chemical composition as the surrounding mantle) or represent chemical unconformities as well (i.e. are thermochemical in nature, of different chemical composition from the surrounding mantle).
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