Observation of gravity waves during the extreme tornado outbreak of 3 April 1974

Hung, R. J.; Phan, T.; Smith, R. E.

doi:10.1016/0021-9169(78)90033-8

Cited by 85 publications

(35 citation statements)

References 20 publications

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“…Both waves with wave periods of 3 and 3. 896 min are within the range of the wave periods of acoustic-gravity waves associated with thunderstorms detected at ionospheric heights (DAVIES and JONES, 1972;SMITH and HUNG, 1975), and waves with wave periods of 13 min are in the range of wave periods of acoustic-gravity waves associated with tornadic storms (HUNG et al, 1978a;HUNG and SMITH, 1978).…”

Section: Mechanism Of Wave Generation and Resonant Interactions Of Wamentioning

confidence: 71%

“…These sites are located in the Tennessee Valley area. A detailed description of the array system has been given by HUNG et al (1978a).…”

Section: Analysis Of Ionosphere Observationsmentioning

confidence: 99%

“…Analyses of six sets of data from the extreme tornado outbreak of April 3, 1974, showed that gravity waves with wave periods of 11 to 15 min and 26 to 30 min, horizontal wavelengths in the range 100 to 220 km, and horizontal phase speeds in the range 90 to 220 m/sec were closely associated with tornadic storms (HUNG et al 1978a for details).…”

Section: Analysis Of Ionosphere Observationsmentioning

confidence: 99%

“…The effect of wind is taken into account by considering the time-space transformation given by the Galilean transformations of the displacement vector, time, Doppler shifted wave frequency, and wave vector. The detailed description of the group ray tracing computation is given in HUNG et al (1978a).…”

Section: Reverse Ray Tracing and Wave Sourcesmentioning

confidence: 99%

“…In other words, 3 to 5 min acoustic-gravity waves associated with severe thunderstorms observed in ionospheric heights (BAKER and DAVIES, 1969;SMITH and HUNG, 1975;JONES and GEORGES, 1976) can be transformed to 11 to 14 min gravity waves associated with tornadic storms (HUNG et al, 1978a;HUNG and SMITH, 1978), as the severe thunder- storms developed into tornadic storms, through the wave-wave resonant interaction. If this mechanism is true, the evolution of tornadic storms from severe thunderstorms can be revealed through the study of the transformation of acoustic-gravity waves associated with severe thunderstorms to acoustic-gravity waves associated with tornadoes.…”

Section: Mechanism Of Wave Generation and Resonant Interactions Of Wamentioning

confidence: 99%

See 4 more Smart Citations

Dynamics of severe storms through the study of thermospheric-tropospheric coupling.

Hung

Smith

1979

J. geomagn. geoelec

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Atmospheric acoustic-gravity waves associated with severe local thunderstorms, tornadoes, and hurricanes can be studied through the coupling between the thermosphere and the troposphere. Reverse group ray tracing computations of acoustic-gravity waves observed by an ionospheric Doppler sounder array, show that the wave sources are in the neighborhood of storm systems and the waves are excited prior to the storms. It is suggested that the overshooting and ensuing collapse of convective turrets may be responsible for generating the acoustic-gravity waves observed. The results of this study also show that the study of wave-wave resonant interactions may be a potential tool for investigating the dynamical behavior of severe storm systems using ionospheric observations of atmospheric acoustic-gravity waves associated with severe storms.

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Section: Mechanism Of Wave Generation and Resonant Interactions Of Wamentioning

confidence: 71%

“…These sites are located in the Tennessee Valley area. A detailed description of the array system has been given by HUNG et al (1978a).…”

Section: Analysis Of Ionosphere Observationsmentioning

confidence: 99%

Section: Analysis Of Ionosphere Observationsmentioning

confidence: 99%

Section: Reverse Ray Tracing and Wave Sourcesmentioning

confidence: 99%

Section: Mechanism Of Wave Generation and Resonant Interactions Of Wamentioning

confidence: 99%

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Dynamics of severe storms through the study of thermospheric-tropospheric coupling.

Hung

Smith

1979

J. geomagn. geoelec

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A Case Study on the Detailed Process of the Ionospheric Responses to the Typhoon

Xiao

Hao

Zhang

et al. 2006

Chinese J. Geophys.

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A case study is presented to reveal the detailed process of the ionospheric responses to disturbances in the lower atmosphere when a strong typhoon lands or approaches the mainland. The ionospheric HF Doppler shift data during the periods of two strong typhoons which occurred in 1988 and 1990 respectively are analyzed in detail. The results show that except the appearance of significant wave‐like disturbances (in general, medium‐scale acoustic‐gravity waves AGWs) in the ionosphere there are some new phenomena worth noticing: the temporal evolution of these waves in the two cases show clearly the change of both the main frequency and amplitude, the frequency was getting lower and lower as time elapses, and the amplitude enhanced gradually. After sunset, Spread‐F phenomena appeared, showing the role of seeding of the AGWs for exciting of ionospheric irregularities. A comparison is made of the above phenomena with the linear theory of TIDs propagation and also with a nonlinear numerical simulation of the dynamic features of AGWs propagation in the atmosphere. All these results are in good agreement and the main features of ionospheric response to typhoon were thus explained.

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Slosh Wave Excitation of Cryogenic Liquid Helium in Gravity Probe-B Rotating Dewar

Hung

Lee

Leslie

1992

Advances in Cryogenic Engineering

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Observation of gravity waves during the extreme tornado outbreak of 3 April 1974

Cited by 85 publications

References 20 publications

Dynamics of severe storms through the study of thermospheric-tropospheric coupling.

Dynamics of severe storms through the study of thermospheric-tropospheric coupling.

A Case Study on the Detailed Process of the Ionospheric Responses to the Typhoon

Slosh Wave Excitation of Cryogenic Liquid Helium in Gravity Probe-B Rotating Dewar

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