Acoustic energy transfer to the upper atmosphere from sinusoidal sources and a role of nonlinear processes

Krasnov, V. M.; Drobzheva, Ya.V.; Laštovička, Jan

doi:10.1016/j.jastp.2007.04.011

Cited by 18 publications

(22 citation statements)

References 11 publications

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“…That is, however, not surprising. The simple analytic model for attenuation assumes plane wave propagation and does not consider nonlinear effects [e.g., Krasnov et al 2007]. Maruyama and Shinagawa 2014 also reported that simple analytic solution gives a bit larger amplitude than full-wave modeling.…”

Section: Wave Amplitudesmentioning

confidence: 99%

“…Only strong earthquakes which generate seismic waves with sufficiently long periods, approximately longer than 10 s, produce ionospheric responses observable in the ionosphere. The infrasound of periods shorter than about 10 s attenuates below the F2 region heights (~200 km) and is usually not reliably detected by remote sounding [Blanc 1985;Krasnov et al 2007;Lastovicka et al 2010;Occhipinti et al 2010;Rolland et al 2011].…”

Section: Introductionmentioning

confidence: 99%

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Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere

Chum

Liu

Laštovička

et al. 2016

Earth Planets Space

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Ionospheric signatures possibly induced by the Nepal earthquake are investigated far outside the epicentral region in Taiwan (~3700 km distance from the epicenter) and in the Czech Republic (~6300 km distance from the epicenter). It is shown that the ionospheric disturbances were caused by long period,~20 s, infrasound waves that were excited locally by vertical component of the ground surface motion and propagated nearly vertically to the ionosphere. The infrasound waves are heavily damped at the heights of F layer at around 200 km, so their amplitude strongly depends on the altitude of observation. In addition, in the case of continuous Doppler sounding, the value of the Doppler shift depends not only on the advection (up and down motion) of the reflecting layer but also on the compression/ rarefaction of the electron gas and hence on the electron density gradient. Consequently, under significant differences of reflection height of sounding radio waves and partly also under large differences in plasma density gradients, the observed ionospheric response at larger distances from the epicenter can be comparable with the ionospheric response observed at shorter distances, although the amplitudes of causative seismic motions differ by more than one order of magnitude.

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Section: Wave Amplitudesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere

Chum

Liu

Laštovička

et al. 2016

Earth Planets Space

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show abstract

“…(2) More important, infrasonic signals excited by the earthquake of 28 October 2008 were at frequencies, which were too high to penetrate into the ionosphere (e.g., Blanc, 1985;Krasnov et al, 2006Krasnov et al, , 2007. Typical ionospheric infrasound (periods tens of seconds to a few minutes) was not excited by this earthquake; this part of spectrum revealed undisturbed pattern.…”

Section: Ionospheric Effects Of Seismo-infrasound Burstsmentioning

confidence: 99%

Simultaneous infrasonic, seismic, magnetic and ionospheric observations in an earthquake epicentre

Laštovička¹,

Baše²,

Hruška³

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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“…The effects of infrasound on the middle and upper atmosphere in terms of temperature fluctuations have been quantified by e.g. Schubert et al (2005), Krasnov et al (2007) or Pilger and Bittner (2009). Neither pressure nor temperature fluctuations in the atmosphere can be easily measured above the stratosphere.…”

Section: Introductionmentioning

confidence: 99%

Mesopause temperature perturbations caused by infrasonic waves as a potential indicator for the detection of tsunamis and other geo-hazards

Bittner

Höppner

Pilger

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Abstract. Many geo-hazards such as earthquakes, tsunamis, volcanic eruptions, severe weather, etc., produce acoustic waves with sub-audible frequency, so called infrasound. This sound propagates from the surface to the middle and upper atmosphere causing pressure and temperature perturbations. Temperature fluctuations connected with the above mentioned events usually are very weak at the surface, but the amplitude increases with height because of the exponential decrease of atmospheric pressure with increasing altitude. At the mesopause region (80-100 km height) signal amplitudes are about two to three orders of magnitude larger than on the ground.The GRIPS (GRound-based Infrared P-branch Spectrometer) measurement system operated by the German Remote Sensing Data Center of the German Aerospace Center (DLR-DFD) derives temperatures of the mesopause region by observing hydroxyl (OH) airglow emissions in the near infrared atmospheric emission spectrum originating from a thin layer at approximately 87 km height.The GRIPS instrument is in principle suited for the detection of infrasonic signals generated by e.g. tsunamis and other geo-hazards. This is due to the fact that the infrasound caused by such events should induce observable shortperiod fluctuations in the OH airglow temperatures. First results obtained during a field campaign performed at the Environmental Research Station "Schneefernerhaus", Zugspitze (47.4 • N, 11.0 • E) from October to December 2008 are presented regarding potential sources of meteorological and orographical origin.Correspondence to: M. Bittner (michael.bittner@dlr.de) An adequate distinction of the overlapping infrasonic signatures caused by different infrasound sources in the OH temperature record is needed for the ascription to the proper source. The approach presented here could form a contribution to a hazard monitoring and early warning system.

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Acoustic energy transfer to the upper atmosphere from sinusoidal sources and a role of nonlinear processes

Cited by 18 publications

References 11 publications

Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere

Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere

Simultaneous infrasonic, seismic, magnetic and ionospheric observations in an earthquake epicentre

Mesopause temperature perturbations caused by infrasonic waves as a potential indicator for the detection of tsunamis and other geo-hazards

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