Winds in the upper atmosphere

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Abstract

<jats:title>Abstract</jats:title><jats:p>A systematic study of the winds in the upper atmosphere has been carried out during the 5‐yr period 1953 to 1958. At heights of 85 to 100 km regular prevailing and periodic tidal wind components have been resolved. Components of the prevailing wind of about 20 m sec<jats:sup>–1</jats:sup> towards east are observed during the summer and winter months, with similar westward components during spring and weak westward winds in autumn. Large southward components of approximately 20 m sec<jats:sup>–1</jats:sup> are observed during the summer. The amplitude of the semi‐diurnal periodic wind is also about 20 m sec<jats:sup>–1</jats:sup>, and this component can usually be represented by a vector which rotates in a clockwise direction with constant amplitude twice every 24 hours. Large departures from this simple model occur at certain times of the year. Measurements of the 24‐hr and 8‐hr periodic wind systems are also described, and an upper limit of 2 m sec<jats:sup>–1</jats:sup> is determined for the lunar semi‐diurnal wind component.</jats:p>

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