Magnetic Waves: https://www.ucl.ac.uk/news/2021/jan/m… Galaxies Collide: https://www.u-tokyo.ac.jp/focus/en/pr… Roman Sphere Hunter: https://www.nasa.gov/feature/goddard/… Trees v Depression: https://www.idiv.de/en/news/news_sing…
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 to higher-than-usual levels of radiation.
Current literature suggests that a slow weakening of the geomagnetic field is one of several causes for the changes in the borders of the SAA since its discovery. As the geomagnetic field continues to weaken, the inner Van Allen belt gets closer to the Earth, with a commensurate enlargement of the SAA at given altitudes.