KERSLEY, L. et al. Total electron content - A key parameterin propagation: measurement and usein ionospheric imaging. Annals of Geophysics, [S. l.], v. 47, n. 2-3 Sup., 2004. DOI: 10.4401/ag-3286. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3286. Acesso em: 6 apr. 2026.