INVESTIGATION OF SHORT TIME PERIOD VARIATIONS OF SEVERAL ATMOSPHERIC PARAMETERS ABOVE 30 KM.
ARMY ELECTRONICS RESEARCH AND DEVELOPMENT ACTIVITY WHITE SANDS MISSILE RANGE N MEX
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Atmospheric tidal effects, local change of temperature, density, and vertical velocities are studied using data gathered by 23 meteorological rocket soundings. The presence of marked diurnal and semidiurnal cycles in the wind data indicated definite tidal effects. The tidal motions appear to occur in layers of strong and weak oscillations with different phases in the different layers. The amplitude of the diurnal wave was greater than the amplitude of the semidiurnal wave. The response of the stratopause region to the input of solar energy is emphasized by the fact that the amplitude of the diurnal wave was largest at 45 km. Instead of a steady increase in amplitude with height, the amplitude appears to undergo systematic fluctuations with height, with peaks at preferred altitudes. The data indicate a diurnal temperature range of at least 15-20C near 55 km, decreasing to about 5C at 30 km. Minimum temperatures were recorded near 0400 to 0600 MST and maximum temperatures occurred about 1400 MST. Maximum values for pressure and density above 42 km occurred generally during daylight with some evidence of an 8-hour cycle in the values. The pressure and density values are in good agreement with past observations relative to the season and the U. S. Standard Atmosphere 1962. Vertical velocities were computed using the adiabatic method which assumes that changes of state of atmospheric air are adiabatic. The vertical velocity below 40 km was less than one cmsec and gradually increased to two cmsec downward at 48 km. Author