Computer Science
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..913b&link_type=abstract
Planetary and Space Science, vol. 26, Oct. 1978, p. 913-924. Research supported by the Science Research Council.
Computer Science
Atmospheric Density, Density Measurement, Satellite Orbits, Skylab 1, Upper Ionosphere, Annual Variations, Decay Rates, Density Distribution, Orbit Decay, Orbital Elements, Perigees, Tables (Data)
Scientific paper
On February 8, 1974, Skylab 1 was maneuvered into a near-circular orbit of inclination 50.04 deg and perigee near 420 km. Orbital parameters have been computed at forty-six epochs thereafter using all available observations. Using these orbital elements, supplemented by orbital decay rates derived from NORAD bulletins, 193 values of air density were determined between February 23, 1974, and August 11, 1976. Corrected to a fixed height and normalized with respect to exospheric temperature, these values reveal the semiannual variation, exhibiting maxima in March-April and October-November and minima in January-February and July-August. For 1974-1976 the July minima are more pronounced than the January minima, while the April and October maxima appear equal. Overall the variation is greater than that indicated by CIRA 1972.
Brookes Jennifer C.
Moore Patrick
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