Upper atmospheric winds refer to:?

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-1 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-1 are observed during the summer. The amplitude of the semi-diurnal periodic wind is also about 20 m sec-1, 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.