1. Critical frequencies of the ionospheric F1 and F2 layers during the last four solar cycles: Sunspot group type dependencies. (June 2018) Authors: Yiğit, Erdal; Kilcik, Ali; Elias, Ana Georgina; Dönmez, Burçin; Ozguc, Atila; Yurchshyn, Vasyl; Rozelot, Jean-Pierre Journal: Journal of atmospheric and solar-terrestrial physics Issue: Volume 171(2018) Page Start: 157 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗