Computer Science – Sound
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25.1011b&link_type=abstract
Planetary and Space Science, vol. 25, Nov. 1977, p. 1011-1020.
Computer Science
Sound
Atmospheric Density, Ionospheric Sounding, Orbit Calculation, Sounding Rockets, Chinese Space Program, Density Measurement, Photographic Tracking
Scientific paper
The China 2 rocket, 1971-18B, was launched on March 3, 1971, into an orbit inclined at 69.9 deg to the equator, with an initial perigee height of 265 km. Analysis of its orbit has yielded values of air density at average intervals of 6 days between July 1971 and January 1972. When corrected to a fixed height, the density exhibits a correlation with the geomagnetic index Ap and the solar 10.7-cm radiation. With values of density extending over seven months it is possible to examine a complete cycle of the semiannual variation at a height near 300 km. The values of density, corrected for the day-to-night variation and for solar and geomagnetic activity, reveal minima in mid-August and late January; at the intervening maximum, in early November, the density is almost 40% higher than at the minima.
Brookes Jennifer C.
Ryland C. E. F.
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