Low-Frequency Atmospheric Acoustic Energy Associated with Vortices Produced by Thunderstorms

@article{Bedard2005LowFrequencyAA,
  title={Low-Frequency Atmospheric Acoustic Energy Associated with Vortices Produced by Thunderstorms},
  author={A. Bedard},
  journal={Monthly Weather Review},
  year={2005},
  volume={133},
  pages={241-263}
}
  • A. Bedard
  • Published 2005
  • Geology
  • Monthly Weather Review
An infrasonic observatory collocated with the Colorado State University CHILL radar during the summer of 1995 permitted unique comparisons between severe storm kinematics and detected acoustic energy at subaudible frequencies near 1 Hz. Radar observations of a velocity couplet aloft (evolving into a tornado) showed a circulation maximum descending for about 30 min while moving to the east. The detected infrasound followed the trend of these observations. A model of sound radiated from vortex… Expand
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References

SHOWING 1-10 OF 53 REFERENCES
Detection of infrasonic pulses from thunderclouds
Acoustic data obtained from thunderstorm observations during 1975 near Socorro, New Mexico, and during 1976 at J. F. Kennedy Space Center, Florida, exhibited single, infrasonic pulses superimposed on… Expand
Infrasound from convective storms: An experimental test of electrical source mechanisms
We performed an experiment to test the suggestion that the infrasound radiated by certain severe storms is caused by lightning. During the 1972 storm season we recorded at Boulder, Colorado, the rate… Expand
A Climatology of Gravity Waves and Other Coherent Disturbances at the Boulder Atmospheric Observatory during March–April 1984
Abstract We present a climatological study of gravity waves and other coherent disturbances at the Boulder Atmospheric Observatory, during the period mid-March-mid-April 1984. The data were collected… Expand
Infrasonic signals from thunder
Infrasonic signals from thunder have been observed at Palisades, New York, over a number of years. The signals are, in general, dominated by sharp rarefaction pulses with periods in the range of… Expand
Infrasound from convective storms: Examining the evidence
Two kinds of waves, infrasonic pressure fluctuations recorded on the ground and certain wavelike fluctuations in ionospheric phase height recorded by ground-based radio sounders, have been… Expand
Infrasound from convective storms. III. Propagation to the ionosphere
We model mathematically the spectral features of infrasound observed in the ionosphere and believed to be radiated by severe thunderstorms. We explain the dominant 2–5‐min wave period as an effect of… Expand
Observations of the wind field in tornadoes, funnel clouds, and wall clouds with a portable Doppler radar
Abstract A severe-storm intercept field program was held in Oklahoma and nearby parts of Texas during the 1987–38 spring seasons. The purpose of the experiment was to use, for the first time, a… Expand
Waves in the atmosphere : atmospheric infrasound and gravity waves : their generation and propagation
Development in Atmospheric Science, 2 In recent years 'here has been increased interest in mesoscale atmospheric waves as newly developed atmospheric probes such as radars and acoustic echo… Expand
Case study using arrays of infrasonic microphones to detect and locate meteors and meteorites
On 22 April 1975, two infrasonic observatories in Colorado detected acoustic signals related to a fireball sighting. We use the infrasonic data in conjunction with surface and aircraft observations… Expand
A Study of Thunderstorm Microphysics with Multiparameter Radar and Aircraft Observations
Abstract Excellent agreement was found between multiparameter radar signatures of hail, raindrops, and mixed-phase precipitation and in situ precipitation particle measurements made by aircraft in a… Expand
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