UPPER-ATMOSPHERE-DENSITY DETERMINATION USING NRL ARTIFICIAL SATELLITES
NAVAL RESEARCH LAB WASHINGTON DC
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NRL has had several artificial satellites placed in orbit for various experimental purposes. By observing the changes in orbital elements, it has been possible to calculate the density at the altitude range of 950 to 1160 km for the past 3 years. Long- and short-term effects are noted and discussed. A cyclical variation of 27 days has been found. It is apparently due to the variation in solar activity with the suns rotation. The centers of activity appear to be stationary on the suns surface for months at a time.
- Atmospheric Physics