Seismic waves in the ionosphere

Lognonné, Philippe; Garcia, Raphaël; Crespon, F.; Occhipinti, G.; Kherani, A.; Artru-Lambin, J.

doi:10.1051/epn:2006401

Cited by 32 publications

(20 citation statements)

References 12 publications

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“…In addition, there are no identifiable seasonal variations. The AGWs propagating into the thermosphere are expected to dissipate over spatial scales of two to three horizontal wavelengths [e.g., Lognonné et al , 2006a, 2006b; Vadas , 2007]. This assumes that the continuous pumping of AGWs into the thermosphere is similar to the case of a single transient AGW propagating through the thermosphere.…”

Section: Discussionmentioning

confidence: 99%

Arecibo's thermospheric gravity waves and the case for an ocean source

et al. 2010

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[1] Wave-like disturbances in electron density n e have been observed in the thermosphere above Arecibo Observatory, Puerto Rico throughout its 45 year history. However, only recently has it become evident that these waves are continuously present in the Arecibo thermosphere. The wave characteristics are fairly constant between day and night and from season to season. High-resolution electron density measurements obtained by applying the coded long-pulse radar technique to photoelectron-enhanced Langmuir waves are presented. These new observations strongly suggest that the perturbations in electron density are the result of internal acoustic-gravity waves (AGWs) propagating through the Arecibo thermosphere. The AGWs appear to be broadbanded in wave number space. The downward phase trajectories of Dn e /n e between 400 and 120 km combined with the low horizontal phase velocities obtained from airglow measurements support the idea that the AGWs are not ducted but rather are locally produced. In addition, the altitudes at which major peaks in Dn e /n e are observed follow theoretical estimates for nonducted waves. The nominal period of the AGWs is ∼60 min at 250 km altitude, but periods of ∼20 min are also evident at lower attitudes. Classic sources of AGWs do not appear to be consistent with the Arecibo observations of a continuous flux of background AGWs. Ray tracing of the AGWs combined with 630.0 nm airglow observations point to a source location in the Atlantic Ocean that is roughly 2100 km east northeast of Arecibo. Internal ocean waves generated in response to the internal tide at the mid-Atlantic Ridge are the most likely source of Arecibo's thermospheric AGWs.

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Section: Discussionmentioning

confidence: 99%

Arecibo's thermospheric gravity waves and the case for an ocean source

et al. 2010

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“…Minutes later, the gravity-wave-derived TEC perturbations are visible after the earthquake [e.g., Galvan et al, , 2012. Surface Rayleigh waves are an important seismic signature and there is a direct link through dynamic coupling between the energy of ground displacements and the Rayleigh waves [Lognonné et al, 2006a[Lognonné et al, , 2006bRolland et al, 2011].…”

Section: Background and Motivationmentioning

confidence: 99%

Review and perspectives: Understanding natural‐hazards‐generated ionospheric perturbations using GPS measurements and coupled modeling

et al. 2016

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Natural hazards including earthquakes, volcanic eruptions, and tsunamis have been significant threats to humans throughout recorded history. Global navigation satellite systems (GNSS; including the Global Positioning System (GPS)) receivers have become primary sensors to measure signatures associated with natural hazards. These signatures typically include GPS‐derived seismic deformation measurements, coseismic vertical displacements, and real‐time GPS‐derived ocean buoy positioning estimates. Another way to use GPS observables is to compute the ionospheric total electron content (TEC) to measure, model, and monitor postseismic ionospheric disturbances caused by, e.g., earthquakes, volcanic eruptions, and tsunamis. In this paper, we review research progress at the Jet Propulsion Laboratory and elsewhere using examples of ground‐based and spaceborne observation of natural hazards that generated TEC perturbations. We present results for state‐of‐the‐art imaging using ground‐based and spaceborne ionospheric measurements and coupled atmosphere‐ionosphere modeling of ionospheric TEC perturbations. We also report advancements and chart future directions in modeling and inversion techniques to estimate tsunami wave heights and ground surface displacements using TEC measurements and error estimates. Our initial retrievals strongly suggest that both ground‐based and spaceborne GPS remote sensing techniques could play a critical role in detection and imaging of the upper atmosphere signatures of natural hazards including earthquakes and tsunamis. We found that combining ground‐based and spaceborne measurements may be crucial in estimating critical geophysical parameters such as tsunami wave heights and ground surface displacements using TEC observations. The GNSS‐based remote sensing of natural‐hazard‐induced ionospheric disturbances could be applied to and used in operational tsunami and earthquake early warning systems.

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“…Particular interest has been shown in the three-dimensional imaging of the electron density distribution via tomographic processing of total electron content data. The time development of ionospheric perturbations over Japan, extracted from the GEONET satellite network, was found to correlate extremely well with a tsunami originating near Peru (Artru et al, 2005;Lognonne et al, 2006), and further support for the concept of TEC imaging of tsunami-generated ionospheric disturbances has come from modelling of those induced by the 2004 Boxing Day tsunami (Occhipinti et al, 2006). The strength of the coupling between the time-varying surface displacement and any particular atmospheric wave component depends on a number of factors including not only the amplitude of the displacement but, just as importantly, its waveform.…”

Section: Signatures Involving the Ionospherementioning

confidence: 96%

“…Following the Boxing Day Sumatran tsunami of 2004, interest in developing new techniques for tsunami detection increased enormously. One line of enquiry focussed on the application of tomographic inversion of total electron content (TEC) data from dense networks of Global Positioning System (GPS) receivers to image ionospheric disturbances arising from seismic phenomena via the mechanism of upwardly-propagating atmospheric gravity waves (Arteru et al, 2005;Lognonne et al, 2006). In conjunction with this TEC research, improved techniques were developed to model the temporal development of the electron density distribution in the ionosphere (Occhipinti et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

HF Skywave Radar Performance in the Tsunami Detection and Measurement Role

Anderson¹

2011

The Tsunami Threat - Research and Technology

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Seismic waves in the ionosphere

Cited by 32 publications

References 12 publications

Arecibo's thermospheric gravity waves and the case for an ocean source

Arecibo's thermospheric gravity waves and the case for an ocean source

Review and perspectives: Understanding natural‐hazards‐generated ionospheric perturbations using GPS measurements and coupled modeling

HF Skywave Radar Performance in the Tsunami Detection and Measurement Role

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