| Popis: |
A surface explosion of 500 tons of TNT at the Suffield Experiment Station, Alberta, Canada, was monitored with a solion infrasonic microphone at a horizontal distance of 299 km to the southwest. The frequency response of the infrasonic microphone extended from 0.01 to 50 Hz. Statistical analysis using the power spectra and deterministic analysis using the amplitude spectra show a primary signal component at 0.26 Hz. Additional examination of the autocorrelation function and the spectra indicate that an atmospheric modulation of pressure waves may have been encountered. [Work sponsored by the U. S. Army Electronics Research and Development Activity, White Sands Missile Range, New Mexico.] |
