Physics
Scientific paper
Feb 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27..197k&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 2, pp. 197-209
Physics
3
Scientific paper
In a previous paper values of air density at heights from 200 to 800 km at dates between 1957 and 1962 were obtained from the rate of contraction of the orbits of the 38 satellites found to be suitable for the purpose. These and 8 further satellites have now been utilized to derive more values of air density, giving a total of 146 values at dates between 1957 and mid-1964. The results show the great decrease in density as solar activity declined during this time interval: at 500 km height, for example, the daytime density was fifteen times greater in 1958 than in 1964. The amplitude of the variation in density between day and night is also charted throughout the half-cycle of solar activity: in 1964 at 500 km height, for example, the maximum daytime density is about four times greater than the minimum night-time density.
King-Hele D. G.
Quinn Eileen
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