Air density at heights near 200km from the orbit of 1970-65D

Details Air density at heights near 200km from the orbit of 1970-65D Air density at heights near 200km from the orbit of 1970-65D

Mar 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22..403w&link_type=abstract

Planetary and Space Science, Volume 22, Issue 3, p. 403-411.

Physics

Scientific paper

Cosmos 359 rocket, 1970-65D, entered orbit on 22 August 1970, with an initial perigee height of 209 km and inclination 51.2°, and decayed on 6 October 1971. Using the values of perigee height from RAE orbits and decay rates from USAF Spacetrack bulletins, 146 values of air density have been calculated between August 1970 and September 1971, mainly at heights between 180 and 230 km. On ten occasions in 1971 when there were substantial geomagnetic disturbances there were sudden increases in density, the largest being about 32 per cent. When the density was corrected to a fixed height and allowance was made for the day-tonight variation and the effects of solar activity, the dominant feature was a semi-annual variation, with maxima in density centred at 6 November 1970 and 7 April 1971, and minima centred at 5 January and 28 July 1971. The maxima in density are nearly equal and exceed the minima by about 50 per cent.

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