Lepidi, S., L. Cafarella, and L. Santarelli. “Low Frequency Geomagnetic Field Fluctuations at Cap and Low Latitude During October 29-31, 2003”. Annals of Geophysics 50, no. 2 (December 25, 2007): 249–257. Accessed May 25, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4418.