Accession Number : AD0673521

Title :   MEASUREMENTS OF TURBULENCE AND DIFFUSION IN HIGH-ALTITUDE CHEMICAL CLOUDS.

Descriptive Note : Final rept. 15 Jul 66-30 Jun 68,

Corporate Author : TECHNICAL OPERATIONS INC BURLINGTON MASS

Personal Author(s) : Trowbridge,C. A. ; Kofsky,I. L. ; Johnson,R. H.

Report Date : 30 JUL 1968

Pagination or Media Count : 32

Abstract : The convective turbulence and diffusion in the upper atmosphere were calculated from radiometrically-calibrated photographs of luminous tracer chemicals released from rockets. Diffusion coefficients were found by the standard method of measuring the Gaussian width of the glowing cloud. The turbulent flow was characterized by the shape of the logarithmic plot of spectral power density of surface brightness against spatial wave number; this new measurement required the development of a digital computer program for calculating the autocorrelation and spatial frequency spectra from microdensitometrically-sampled photographic radiance data. Results to date are promising in that they correlate well with other measurements of turbulence parameters. (Author)

Descriptors :   (*UPPER ATMOSPHERE, TURBULENCE), (*CLOUDS, DIFFUSION), MEASUREMENT, CHEMICAL COMPOUNDS, LUMINESCENCE, SOUNDING ROCKETS, PHOTOGRAPHY, MATHEMATICAL ANALYSIS, FOURIER ANALYSIS, COMPUTER PROGRAMMING, DIGITAL COMPUTERS, CORRELATION TECHNIQUES

Subject Categories : Atmospheric Physics
      Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE