Other
Scientific paper
Nov 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970p%26ss...18.1573c&link_type=abstract
Planetary and Space Science, Volume 18, Issue 11, p. 1573-1584.
Other
1
Scientific paper
The orbits of five satellites have been analysed to reveal the semi-annual variation in air density at heights between 300 and 505 km during the period of high solar activity in 1967 and 1968, and the results combined with data from other satellites. The semi-annual effect shows considerable variation from cycle to cycle, both in magnitude and in the form of the height dependence. The dates of the maxima and minima given by the individual satellites each year are in very good agreement with each other and are close o the mean values obtained by Jacchia, Slowey and Campbell for the years 1958-1966 this suggests the effect is more regular in its timing than has previously been assumed. The main difficulty in interpreting the results is the lack of data at heights below 250 km. At times the observed magnitudes are compatible with a variation solely in exospheric temperature due to temperature changes in the thermosphere, whereas at other times a variation in conditions at the lower boundary near the turbopause (about 110 km) is required.
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