Accession Number:

AD0691507

Title:

AIR DENSITY AT HEIGHTS OF 140-180 km, FROM ANALYSIS OF THE ORBIT OF 1968-59A.

Descriptive Note:

Technical rept.,

Corporate Author:

ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s):

Report Date:

1969-02-01

Pagination or Media Count:

29.0

Abstract:

The satellite 1968-59A was launched on 11 July 1968 into a polar orbit with an initial perigee height of 160 km and apogee height 1800 km. The satellite did not decay until 6 November 1968, and analysis of its orbit yields values of air density at average intervals of 2 days between July and early November, mainly at heights of 140-180 km. Separate profiles of air density versus height are obtained for July-August and for September-October 1968, with the latter giving values of density about 10 higher. This increase in density reveals the existence of the semi-annual variation in density, well known at greater heights the maximum density in October 1968 was about 20 higher than the minimum in July, for heights near 170 km. Author

Subject Categories:

  • Atmospheric Physics
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE