1. Bilitza , D. 1990 International Reference Ionosphere 1990 Natl. Space Sci. Data Cent. Greenbelt, Md.
2. Structure and dynamics of the winter polar cap F region;Buchau;Radio Sci.,1983
3. Solar cycle dependence of polar cap patch activity;Dandekar;Radio Sci.,2002
4. Danskin , D. W. E. M. Warrington A. J. Stocker D. Boteler 2011 Monitoring of HF communication links in northern polar regions
5. Honary , F. O. Ogunmodimu S. Marple A. Kavanagh 2011 Forecasting radio auroral absorption