Response of The Ionospheric E- Region Critical Frequency and Virtual Height to the Solar Cycle 22 over Baghdad. Iraqi Journal of Science, [S. l.], v. 63, n. 10, p. 4576–4586, 2022. DOI: 10.24996/ijs.2022.63.10.39 . Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/5420.. Acesso em: 7 apr. 2025.