Ionized Atmosphere:
IRI90 model
Neutral Atmosphere: CIRA72 model
Collision Frequency: Banks and Kockarts,
Aeronomy: part A, Chapter 9, Academic Press, 1973.
References
D.Bilitza, International Reference Ionosphere 1990,
National Space Science Data center/ World Data Center -A
for Rockets and Satellites, 1990.
D.Rees, Cosper International Reference Atmosphere: 1986
Part I:Thermosphere Models, Advances in Space Research
Vol.8 No 5-6, Pergamon Press,1988.
P.M. Banks and G. Kockarts,
Aeronomy: Part A, Academic Press, 1973.