Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1501m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 31, Dec. 1983, p. 1501-1515. Research sponsored by the Science and Engineerin
Physics
5
Annual Variations, Atmospheric Density, Orbit Decay, Orbital Elements, Satellite Orbits, Atmospheric Models, Atmospheric Temperature, Heos B Satellite, Maxima, Minima
Scientific paper
NORAD orbital-decay-rate data on the HEOS-2 second-stage rocket (1972-05B) from 1973-1978 are analyzed at 712 epochs to determine the air-density variation. The data are normalized to three fixed heights, and the effects of solar and geomagnetic activity and diurnal variations are removed before investigating the semi-annual residual-air-density variation. The data and results are presented in tables and graphs. The mean 335-km density-index maxima are 1.22 on April 19 and 1.18 on November 12; the minima are 0.74 on January 14 and either 0.65 (1974-76) or 0.82 (1977-78) on July 26. The overall variation amplitude and (after mid-1977) the absolute values are found to be higher than those of model atmospheres.
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