There's a region of Earth's atmosphere known as the South Atlantic Anomaly, and it’s one of the most dangerous near-Earth areas of space, both for satellites and humans.

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Sources:

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Images:

https://www.nasa.gov/audience/forstud...
https://www.researchgate.net/figure/M...
https://svs.gsfc.nasa.gov/20057
https://svs.gsfc.nasa.gov/11013
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