Physical modeling of long-range infrasonic propagation in the atmosphere

Kulichkov, S. N.; Chunchuzov, I. P.; Bush, G. A.; Perepelkin, V. G.

doi:10.1134/s0001433808020059

Cited by 21 publications

(23 citation statements)

References 4 publications

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“…,31,33 ٌͩ H 2 + a ‫ץ‬ ϫĜ a ͑x H ,z,y H ,zЈ,͒ = ␦͑x H − y H ͒␦͑z − zЈ͒ for z Ͼ 0 with c eff ͑z͒ = c a ͑z͒ + k · v 0 ͑z͒ and with rigid ground boundary conditions ͯ ‫ץ‬ P a ͑x H ,z,͒ taken at z = 0. For the purposes of this example the sound speed c a is taken to be given by the polynomial fit to the "Standard Atmosphere" 34 given in Ref 35…”

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confidence: 99%

The radiation of atmospheric microbaroms by ocean waves

Waxler

Gilbert

2006

The Journal of the Acoustical Society of America

116

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A two-fluid model, air over seawater, is used to investigate the radiation of infrasound by ocean waves. The acoustic radiation which results from the motion of the air/water interface is known to be a nonlinear effect. The second-order nonlinear contribution to the acoustic radiation is computed and the statistical properties of the received microbarom signals are related to the statistical properties of the ocean wave system. The physical mechanisms and source strengths for radiation into the atmosphere and ocean are compared. The observed ratio of atmospheric to oceanic microbarom peak pressure levels ͑approximately 1 to 1000͒ is explained.

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confidence: 99%

The radiation of atmospheric microbaroms by ocean waves

Waxler

Gilbert

2006

The Journal of the Acoustical Society of America

116

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“…With respect to the inability to completely explain the third branch of arrivals in Figure 6, the problem may not simply be related to errors in the atmospheric specifications as provided. Other issues involve assumptions made about the propagation physics, including not properly accounting for the presence of the subgridscale internal gravity wavefield [ Chunchuzov , 2004; Kulichkov et al , 2008], as well as nonlinear acoustic wave propagation effects [ Millet et al , 2007]. The results in Figure 10 show several discrete bands of detections with classically predicted shadow zones, while the observations shown in Figure 3 indicate a continuous distribution of detections at all ranges.…”

Section: Discussionmentioning

confidence: 99%

A study of acoustic propagation from a large bolide in the atmosphere with a dense seismic network

et al. 2010

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[1] A large meteor entered the atmosphere above northeastern Oregon on 19 February 2008 at 530 PST. Several hundreds of broadband seismic stations in the U.S. Pacific Northwest recorded acoustic-to-seismic coupled signals from this event. The travel times of the first arriving energy are consistent with a terminal explosion source model, suggesting that the large size of the explosion masked any signals associated with a continuous line source along its supersonic trajectory. Several infrasound arrays in North America also recorded this event. Both the seismic and infrasound data have been used to locate the explosion in 3-D space and time. Climatological atmospheric velocity models predict that infrasound signals from sources that occur at mid-northern latitudes in winter are usually ducted to the east due to eastward zonal winds. In this paper, we analyze travel time picks and use 3-D ray tracing to generate synthetic travel times based on various atmospheric models to show that the seismic network data instead reveal a predominant westward propagation direction. A sudden stratospheric warming event that reversed the zonal wind flow explains this westward propagation. The seismic data illuminate in unprecedented spatial detail the range and azimuthal definition of shadow zones out to a range of 500 km, suggesting that dense seismic networks can be used to study infrasound propagation at spatial resolutions that exceed that which can be done with only a handful of globally distributed infrasound arrays.Citation: Hedlin, M. A. H., D. Drob, K. Walker, and C. de Groot-Hedlin (2010), A study of acoustic propagation from a large bolide in the atmosphere with a dense seismic network,

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“…Besides the classical models (Gossard and Hooke, 1975) and detailed calculations of the waves from localized sources such as explosions (e.g., Pokhotelov et al, 1995;Calais et al, 1998;Drobzheva and Krasnov, 2003;Kulichkov et al, 2004;Krasnov and Drobzheva, 2005), more general analytical and numerical results have been obtained for specific models of atmospheric profiles (e.g., Savina, 1996;Savina et al, 2006). Recently, numerical results have been obtained in relation to specific earthquakes and tsunamis and compared with observations (e.g., Artru et al, 2001;Occupini et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

Ionospheric effects of ground motion: The roles of magnetic field and nonlinearity

Ostrovsky

2008

Journal of Atmospheric and Solar-Terrestrial Physics

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Physical modeling of long-range infrasonic propagation in the atmosphere

Cited by 21 publications

References 4 publications

The radiation of atmospheric microbaroms by ocean waves

The radiation of atmospheric microbaroms by ocean waves

A study of acoustic propagation from a large bolide in the atmosphere with a dense seismic network

Ionospheric effects of ground motion: The roles of magnetic field and nonlinearity

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