Meteorological measurements in support of the NASA grazing sonic boom experiment at Jackass Flats, Nevada (August and October 1970)
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Meteorological measurements in support of the NASA grazing sonic boom experiment at Jackass Flats, Nevada (August and October 1970)

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Meteorological measurements in support of the NASA grazing sonic boom experiment at Jackass Flats, Nevada (August and October 1970)
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  • Personal Author:
  • Corporate Authors:
    Air Resources Laboratories
  • NOAA Program & Office:
    OAR (Oceanic and Atmospheric Research)ARL (Air Resources Laboratory)
  • Description:
    The meteorological data in this report were gathered in August, September, and October 1970 at Jackass Flats, Nevada. They were data to support a sonic boom experiment conducted by the National Aeronautics and Space Administration. Sonic booms

    originating from aircraft flying at speeds comparable to the speed of sound at ground level were recorded on the ground and on the 460-m BREN tower on the Nevada Test Site. The propagation velocity of sound was determined by measuring the temperature

    wind speed, and direction from the surface (3 m) to the aircraft flight altitude (10.3 km). These data were collected by rawinsondes, aircraft-mounted and tower-mounted instrumentation. Profiles from these varied systems were compared in regions where the soundings overlap in time and space. Estimates of the rate of kinetic energy dissipation,an important parameter in determining the effect of atmospheric turbulence on weak shocks, were computed from airborne and tower data. Atmospheric stability was calculated from average wind speed and temperatures measured on the BREN tower. An evaluation of sonic boom signatures generated at a Mach number of 1.3, a speed used in earlier NASA studies and above the "threshold" Mach number for that day, indicates the large amplitude variations that can occur in the desert. When the gradient of the propagation velocity in the lowest km is small, the paths of rays generated at low Mach numbers are shown, by a computer model, to pass close to local topographic features.

  • Keywords:
  • Series:
    NOAA technical memorandum ERL ARL ; 35
  • Document Type:
    Technical Memorandum
  • License:
  • Rights Information:
    CC0 Public Domain
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    Library
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