Afraimovich, E. L., E. A. Kosogorov, L. A. Leonovich, O. S. Lesyuta, and I. I. Ushakov. “GPS Detection of the Instantaneous Response of the Global Ionosphere to Strong Magnetic Storms With Sudden Commencement”. Annals of Geophysics 45, no. 1 (December 25, 2002). Accessed May 22, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3490.