“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” (2023) Iraqi Journal of Science, 57(3A), pp. 2063–2074. Available at: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9962 (Accessed: 3 July 2024).