THE LARGE SEMI-ANNUAL VARIATION IN EXOSPHERIC DENSITY: A POSSIBLE EXPLANATION
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
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An analysis of the orbit of the satellite Calsphere 1 confirms the large semi-annual variation in density at heights near 1100 km previously found from the orbit of Echo 2, and not predicted by present atmospheric models. This variation is probably due to relatively smaller variations at much lower altitudes, in particular variations at heights near 120 km, which is taken as the lower boundary for the construction of upper-atmosphere models.
- Atmospheric Physics