222 



SMITHSONIAN CONTRIBUTIONS TO ASTROPHYSICS 



Cook, G. E. 



1965. Private communication. 

 Harris, I., and Priester, W. 



1962a. Time-dependent structure of the upper 

 atmosphere. Journ. Atmosph. Sci., vol. 

 19, pp. 286-301. 

 1962b. Theoretical models for the solar-cycle vari- 

 ations of the upper atmosphere. Journ. 

 Geophys. Res., vol. 67, pp. 4585-4591. 



HlNTEREGGER, H. E. 



1962. Absorption spectrometric analysis of the 



upper atmosphere in the E.U.V. region. 

 Journ. Atmosph. Sci., vol. 19, pp. 351-368. 

 Izakov, M. N. 



1965. Some problems of investigating the structure 

 of the upper atmosphere and constructing 

 its model. In P. Muller, ed., Space Re- 

 search V, North-Holland, Amsterdam, 

 pp. 1191-1213. 

 Jacchia, L. G. 



1959. Corpuscular radiation and the acceleration 

 of artificial satellites. Nature, vol. 183, 

 pp. 1662-1663. 

 1964. The temperature above the thermopause. 

 Smithsonian Astrophys. Obs. Spec. Rep., 

 no. 150, 32 pp. 

 Jacchia, L. G., and Slowey, J. 



1963. Accurate drag determinations for eight arti- 



ficial satellites; atmospheric densities and 

 temperatures. Smithsonian Contr. Astro- 

 phys., vol. 8, no. 1, pp. 1-99. 

 1964a. Temperature variations in the upper at- 

 mosphere during geomagnetically quiet 

 intervals. Journ. Geophys. Res., vol. 69, 

 pp. 4145-4148. 



1964b. An analysis of the atmospheric drag of the 

 Explorer IX satellite from precisely re- 

 duced photographic observations. In P. 

 Muller, ed., Space Research IV, North- 

 Holland, Amsterdam, pp. 257-270. 



1964c. Atmospheric heating in the auroral zones: 

 a preliminary analysis of the atmospheric 

 drag of the Injun 3 satellite. Journ. 

 Geophys. Res., vol. 69, pp. 905-910. 

 Kockarts, G., and Nicolet, M. 



1962. Le probleme aeronomique de l'h61ium et de 



l'hydrogene neutres. Ann. de Geophys., 

 vol. 18, pp. 269-290. 



1963. L'helium et l'hydrogene atomique au cours 



d'un minimum d'activite' solaire. Ann. 

 de Geophys., vol. 19, pp. 370-385. 

 Nicolet, M. 



1961. Density of the heterosphere related to tem- 

 perature. Smithsonian Astrophys. Obs. 

 Spec. Rep., no. 75, 30 pp. 



1963. La constitution et la composition de 1 'at- 



mosphere superieure. In C. DeWitt, 

 J. Hieblot, and A. Lebean, eds., Geo- 

 physics, The Earth's Environment, Gordon 

 and Breach, Science Publishers, New York. 

 Purcell, J. D.; Garrett, D. L. ; and Tottsey, R. 



1964. Spectroheliograms in the extreme ultraviolet 



(abstract). Astron. Journ., vol. 69, p. 147. 

 Small, H. W. 



1964. Atmospheric density between 70 and 200 

 nautical miles from satellite observations. 

 Lockheed Missiles and Space Company, 

 Tracking Note no. 23. 

 Zirm, R. R. 



1964. Variations in decay rate of satellites. Journ. 

 Geophys. Res., vol. 69, pp. 4696-4697. 



Abstract 



Tables of atmospheric density and composition are computed for a wide range of exospheric temperatures, 

 starting from a fixed set of boundary conditions at 120 km. The diffusion equation is integrated following em- 

 pirical temperature profiles of exponential form capable of reproducing the densities derived from satellite drag over 

 the years. Formulae are given which relate the exospheric temperature to solar and geomagnetic activity and allow 

 for the diurnal and semiannual variations. The different response of the density at the 200 km. level to different 

 types of heating is briefly discussed. 



