Effect of Total, Northern and Southern Hemisphere Sunspot Number (Ri, Rn and Rs) on F2- Layer Critical Frequencies at Mid- Latitude Rome Station During the Descending Phase of Solar Cycle 23. Iraqi Journal of Science, [S. l.], v. 57, n. 3A, p. 2063–2074, 2023. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9962.. Acesso em: 3 jul. 2024.