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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 ...
In 2011, a study confirmed earlier speculation that the Van Allen belt could confine antiparticles. The Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) experiment detected levels of antiprotons orders of magnitude higher than are expected from normal particle decays while passing through the South Atlantic Anomaly.
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.
Our two or three passes at high altitude through the South Atlantic Anomaly will be almost the entirety of the radiation load on the mission and like an equivalency of three months on the ...
A map of intensity contours is called an isodynamic chart. As the World Magnetic Model shows, the intensity tends to decrease from the poles to the equator. A minimum intensity occurs in the South Atlantic Anomaly over South America while there are maxima over northern Canada, Siberia, and the coast of Antarctica south of Australia. [16]
Map of L-shell field line locations on the surface of the Earth. The real terrestrial field is approximately dipolar, but misaligned with the rotation axis, and offset a few hundred km in the direction opposite to the South Atlantic Anomaly.
The Bangui magnetic anomaly in central Africa and the Kursk magnetic anomaly in eastern Europe (both in red) In geophysics, a magnetic anomaly is a local variation in the Earth's magnetic field resulting from variations in the chemistry or magnetism of the rocks. Mapping of variation over an area is valuable in detecting structures obscured by ...
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 ...