Upper-atmosphere rotational speed and its variation with height

Details Upper-atmosphere rotational speed and its variation with height Upper-atmosphere rotational speed and its variation with height

Oct 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970p%26ss...18.1433k&link_type=abstract

Planetary and Space Science, Volume 18, Issue 10, p. 1433-1438.

Physics

3

Scientific paper

The average rotational speed of the upper atmosphere can be determined by analysing the changes in the orbital inclinations of satellites. This procedure is applied to eleven new orbits to give values of Λ, the ratio of atmospheric angular velocity to the Earth's angular velocity, at heights between 250 and 380 km. When these new results are combined with 21 previous values the variation of Λ with height can be determined over a much wider height range than was previously possible, namely from 200 to 400 km. It is found that Λ increases from about 1.1 at 200 km height to about 1.35 at 300 km, and about 1.45 at 400 km. This implies that the wind is, on average, from west-to-east, with its mean speed increasing from 40 m/sec at 200 km height to 180 m/sec at 400 km (for latitudes near 30°). There is no evidence that Λ varies from year to year or with solar activity.

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