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The Question

(Submitted October 04, 1996)

I would like to know more about the South Atlantic Anomaly. What are its boundaries?

The Answer

The boundaries of the SAA vary with altitude above the Earth. At an altitude of 500 km, the SAA ranges between -90 and +40 in geographic longitude and -50 to 0 in geographic latitude. In this region, the extent of the SAA increases with increasing altitude.

Below is a map of the SAA at an altitude of ~ 560 km. The map was produced ROSAT by monitoring the presence of charged particles. The dark red area shows the extent of the SAA. The green to yellow to orange areas show Earth's particle belts.

South Atlantic Anomaly

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