Macmillan, Susan, Chris Turbitt, and Alan Thomson. “Ascension and Port Stanley Geomagnetic Observatories and Monitoring the South Atlantic Anomaly”. Annals of Geophysics 52, no. 1 (January 25, 2009): 83–95. Accessed April 19, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4632.