Three series of rocket soundings were conducted from high latitude sites during winter. In the first series four pitot pressure soundings were launched during a 13 hour period from Ft. Churches. Canada (59°N) on January 31, and Feb. 1, 1967. The second series consisted of one pitot sounding and two acoustic grenade soundings carried out during a three hour period on January 13-14, 1970. Temperature and wind profiles and one density profile were observed independently to obtain the thermodynamic structure, the wind structure, and thus their interdependence in the mesosphere. The third series of soundings was conducted from Point Barrow, Alaska (71 N) on December 6, 1971. This series consisted of five soundings of which the first two and the last two were pitot-grenade pairs. Temperature profiles from all soundings in each series were averaged, and a smooth curve (or series of smooth curves) drawn through
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