Other
Scientific paper
Apr 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.222..153k&link_type=abstract
Nature, Volume 222, Issue 5189, pp. 153-154 (1969).
Other
1
Scientific paper
ACCURATE observational values of upper atmosphere density are particularly scarce at heights between 125 km and 175 km. At lower heights extensive data are available from rocket flights and other sources, and at heights from 200 km up to 1,200 km the analysis of satellite orbits has provided a fairly complete picture, specified, for example1, in the COSPAR International Reference Atmosphere 1965. The first values of density from analysis of satellite orbits at heights below 160 km, from the satellite 1968-59B launched on July 11, 1968, were reported some months ago2; these values applied at dates between July 11 and the satellite's decay on August 19, 1968. Another satellite launched at the same time, 1968-59A, which had an initial perigee height of 160 km and apogee height of 1,800 km, did not decay until November 6, 1968, and we have analysed its orbit3 to obtain values of air density at average intervals of 2 days between July and early November, chiefly at heights of 140-180 km.
King-Hele D. G.
Walker Doreen M. C.
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