Abstract
I RECENTLY reported1 the results of an analysis that indicated a semi-annual variation in air density at a height of 190 km in 1966–67, with the unexpectedly large maximum to minimum ratio of 1.45. The maxima were in April and October, the minima in January and June, as usual. Newell2 has subsequently discussed these results, and has left two open questions on which I should like to comment.
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References
King-Hele, D. G., Nature, 216, 880 (1967).
Newell, R. E., Nature, 217, 150 (1968).
Cook, G. E., Planet. Space Sci., 15, 627 (1967).
Anderson, A. D., LMSC–6–77–67–40 (Lockheed Missiles and Space Company, Palo Alto, California, 1967).
King-Hele, D. G., and Hingston, J., RAE Tech. Rep. 67321 (1967).
Cook, G. E., and Scott, D. W., Planet. Space Sci., 15, 1933 (1967).
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KING-HELE, D. Semi-annual Variation in Upper Atmosphere Density. Nature 217, 833–834 (1968). https://doi.org/10.1038/217833a0
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DOI: https://doi.org/10.1038/217833a0
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