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Radio Propagation Indices References
Copyright WDC C1 for STP at RAL.
A new index of solar activity based on ionospheric measurements
Journal of Atmospheric and Terrestrial Physics, volume 7, 1955, pages 310-321.
Minnis CM, Bazzard GH
A monthly ionospheric index of solar activity based on F2-layer ionization
at eleven stations
Journal of Atmospheric and Terrestrial Physics, volume 18, 1960, pages 297-305.
Liu RY, Smith PA and King JW
A new solar index which leads to improved foF2 predictions using the
Telecommunication Journal, 1983, Volume 50 (8), pages 408-414.