Computer Science – Sound
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..831h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, July 1978, p. 831-843. Army-supported research
Computer Science
Sound
14
F Region, Gravity Waves, Tornadoes, Traveling Ionospheric Disturbances, Electron Density (Concentration), Ionospheric Sounding, Power Spectra, Ray Tracing, Sound Waves, Wind Profiles
Scientific paper
A continuous wave-spectrum high-frequency radiowave Doppler sounder array was used to observe upper-atmospheric disturbances during an extreme tornado outbreak. The observations indicated that gravity waves with two harmonic wave periods were detected at the F-region ionospheric height. Using a group ray path computational technique, the observed gravity waves were traced in order to locate potential sources. The signals were apparently excited 1-3 hours before tornado touchdown. Reverse ray tracing indicated that the wave source was located at the aurora zone with a Kp index of 6 at the time of wave excitation. The summation of the 24-hour Kp index for the day was 36. The results agree with existing theories (Testud, 1970; Titheridge, 1971; Kato, 1976) for the excitation of large-scale traveling ionospheric disturbances associated with geomagnetic activity in the aurora zone.
Hung R. J.
Phan Tuoc
Smith Robert E.
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