REPORT ON RESEARCH TO INVESTIGATE ATMOSPHERIC INFRASONIC PRESSURE VARIATIONS.
Annual rept. no. 2, 1 Jun 63-31 May 64,
TEXAS UNIV AUSTIN DEFENSE RESEARCH LAB
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The pressure variations of the atmosphere at White Sands Missile Range, New Mexico, were recorded using a solion infrasonic microphone array. The dimensions of the square array were 10,000 ft per side. The solion infrasonic microphone monitored data in the pressure range of 0.1 to 500 dynsq cm and in the frequency region of 0.033 to 50 cps. Measurements were made during high winds 20 to 30 knots and very low winds 0 to 4 knots. The statistical nature of the infrasonic atmospheric pressure data obtained is presented by the use of probability density functions, autocorrelation functions, cross-correlation functions, power spectra, and cross-power spectra. These results indicate that the high-wind infrasound was caused by statistically independent eddies. The eddies were created by large scale atmospheric motions associated with the high winds. The power spectra afforded a means by which relative eddy size estimates were calculated for the high-wind infrasound. The statistical properties of the low-wind data indicate that the low-wind infrasound was probably radiated by upper atmospheric turbulence. Author