F2-region acoustic waves from severe weather

Baker, Donald M.; Davies, K.

doi:10.1016/0021-9169(69)90118-4

Cited by 65 publications

(27 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1). The computed possible wave periods, shown in Table 1, are in exact agreement with wave periods of the acoustic-gravity waves observed by Doppler sounder arrays (BAKER and DAVIES, 1969;DAVIES and JONES, 1972;SMITH and HUNG, 1975;GEORGES and GREENE, 1975;JONES and GEORGES, 1976).…”

Section: Mechanism Of Wave Generation and Resonant Interactions Of Wasupporting

confidence: 74%

“…Ionosphere observations made by BAKER and DAvIEs (1969), DAVIES and JONES (1972), SMITH and HUNG (1975), GEORGES and GREENE (1975), GEORGES (1976), GEORGES (1976), andSMITH (1977a, b) shows that quasi-sinusoidal oscillations, with two harmonics of wave periods, 3 to 5 min and 6 to 9 min, are observed during time periods with thunderstorm activity.…”

Section: Analysis Of Ionosphere Observationsmentioning

confidence: 96%

“…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 2 more Smart Citations

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

Hung

Smith

1979

J. geomagn. geoelec

View full text Add to dashboard Cite

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.

show abstract

Section: Mechanism Of Wave Generation and Resonant Interactions Of Wasupporting

confidence: 74%

Section: Analysis Of Ionosphere Observationsmentioning

confidence: 96%

Section: Mechanism Of Wave Generation and Resonant Interactions Of Wamentioning

confidence: 99%

See 1 more Smart Citation

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

Hung

Smith

1979

J. geomagn. geoelec

View full text Add to dashboard Cite

show abstract

“…The HF Doppler fluctuations associated with the thunderstorms has already been interpreted in terms of infrasonic waves originating in the turbulent air mass and traveling upward by BAKER and DAVIES (1969), DAVIES and JONES (1972) and GEORGES (1973). They reported that the quasi sinusoidal fluctuations were observed when severe thunderstorms with cloud tops in excess of 12km or so occur within a radius of 300km or more from the radio reflection points or only when intense updrafts penetrated the tropopause.…”

Section: Tid Featuresmentioning

confidence: 99%

“…Exception are the HF Doppler soundings of the F-layer reported by GEORGES (1967GEORGES ( , 1968GEORGES ( , 1973. BAKER and DAVIES (1969), DAVIES and JONES (1971a, 1973, PRASAD et al (1975), SMITH and HUNG (1975) and RAJU et al (1981). They have shown that infrasonic waves with the periods of the order of one minute originated from thunderstorms and tornadoes, and contributed significantly to ionospheric perturbations.…”

Section: Introductionmentioning

confidence: 96%

Short-period disturbances in the ionosphere observed at the time of typhoons in September 1982 by a network of HF Doppler receivers.

Okuzawa

Shibata

Ichinose

et al. 1986

J. geomagn. geoelec

View full text Add to dashboard Cite

Short-period disturbances of the ionosphere were observed by a network of HF Doppler receivers in central Japan at the time of typhoons 18 and 19 which crossed the Islands of Japan successively in September 1982.Both dynamic and static spectral analyses on sample records revealed that (1) these waves have the periods ranging between 1.4 and 9.7 min that correspond to infrasound at F-layer heights (and partly to gravity wave at E-layer heights), (2) the spectral content varies from hour to hour, from station to station for a given typhoon, and further one typhoon to the other, and (3) the spectral fine structure does not accord with existing theoretical prediction for thunderstorms. It is, therefore, plausible that the observed spectral peaks arose from the characteristics of the radiation sources in the typhoon air mass.Horizontal and vertical phase velocities, and corresponding wavelengths of the ionospheric waves were also measured using cross-correlation method. It is shown that (1) the horizontal phase velocities take similar values to those observed during the severe thunderstorms and tornadoes so far reported, with scatter range of the values being slightly larger than the latter two, and (2) the mean values of the upward vertical phase velocities are several to ten times larger than those of the horizontal ones.

show abstract

Ionospheric response to infrasonic‐acoustic waves generated by natural hazard events

2015

View full text Add to dashboard Cite

Recent measurements of GPS‐derived total electron content (TEC) reveal acoustic wave periods of ∼1–4 min in the F region ionosphere following natural hazard events, such as earthquakes, severe weather, and volcanoes. Here we simulate the ionospheric responses to infrasonic‐acoustic waves, generated by vertical accelerations at the Earth's surface or within the lower atmosphere, using a compressible atmospheric dynamics model to perturb a multifluid ionospheric model. Response dependencies on wave source geometry and spectrum are investigated at middle, low, and equatorial latitudes. Results suggest constraints on wave amplitudes that are consistent with observations and that provide insight on the geographical variability of TEC signatures and their dependence on the geometry of wave velocity field perturbations relative to the ambient geomagnetic field. Asymmetries of responses poleward and equatorward from the wave sources indicate that electron perturbations are enhanced on the equatorward side while field aligned currents are driven principally on the poleward side, due to alignments of acoustic wave velocities parallel and perpendicular to field lines, respectively. Acoustic‐wave‐driven TEC perturbations are shown to have periods of ∼3–4 min, which are consistent with the fraction of the spectrum that remains following strong dissipation throughout the thermosphere. Furthermore, thermospheric acoustic waves couple with ion sound waves throughout the F region and topside ionosphere, driving plasma disturbances with similar periods and faster phase speeds. The associated magnetic perturbations of the simulated waves are calculated to be observable and may provide new observational insight in addition to that provided by GPS TEC measurements.

show abstract

F2-region acoustic waves from severe weather

Cited by 65 publications

References 10 publications

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

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

Short-period disturbances in the ionosphere observed at the time of typhoons in September 1982 by a network of HF Doppler receivers.

Ionospheric response to infrasonic‐acoustic waves generated by natural hazard events

Contact Info

Product

Resources

About