| Autor: |
Kaschak, George, Donn, William L., Fehr, Uri |
| Zdroj: |
Journal of the Acoustical Society of America; 1970, Vol. 48 Issue 1A, p12-20, 9p |
| Abstrakt: |
Long-range infrasound from large rockets launched at Cape Kennedy have been recorded and studied since 1957 by a variety of low-frequency acoustic sensors. Dominant energy ranges from 0.1 to 2 Hz. Signals can be grouped into early (apparently supersonic) arrivals, normal acoustic arrivals, and late (apparently subsonic) arrivals. The normal acoustic signals detected in the eastern United States from rockets launched in the northeast quadrant from Cape Kennedy show two prominent wave groups generated by the launch and first-stage reentry. The origin of this long-range infrasound is shown to be acoustic energy radiated from the cone of shock waves. The data of early arrivals (supersonic waves) suggests an origin from coupling between normal acoustic waves and those in a higher-speed region. Late arrivals having apparently subsonic velocities are also detected less frequently than the supersonic arrivals. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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