Semi-annual Variation in Upper-atmosphere Density

Details Semi-annual Variation in Upper-atmosphere Density Semi-annual Variation in Upper-atmosphere Density

Jun 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966natur.210.1032k&link_type=abstract

Nature, Volume 210, Issue 5040, pp. 1032 (1966).

Physics

Scientific paper

A SEMI-ANNUAL variation in upper-atmosphere density, with maxima in April and October, and minima in January and July, was discovered in 1960 and has been generally accepted as a feature of the upper atmosphere at heights of 250-600 km. In a recent article, Anderson1 suggested that the variation is a disguised effect of latitude. Anderson's hypothesis can be tested by analysing the orbit of a satellite of a near-circular polar orbit which samples all latitudes in a nearly equal degree. If the semi-annual variation is recognizable in the orbit of such a satellite, it cannot be due to changes in latitude.

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