Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51e..03c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA51E-03
Physics
[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2487] Ionosphere / Wave Propagation, [3339] Atmospheric Processes / Ocean/Atmosphere Interactions, [6934] Radio Science / Ionospheric Propagation
Scientific paper
Ionospheric anomalies following tsunamis are now observable after major events as Total Electron Content (TEC) fluctuations. GPS and altimeters are important tools for this purpose, but the detection depends on satellites-receivers geometry, when the line of sight crosses the moving perturbation parallel to the wave fronts. All these anomalies show the signature in the ionosphere of tsunami-generated internal gravity waves (IGW) propagating in the neutral atmosphere over oceanic regions. Most of these ionospheric anomalies are deterministic and reproducible by numerical modeling via the coupling mechanism between ocean, neutral atmosphere and ionosphere. This numerical modeling supplies useful information for the estimation of expected anomalies and to explore and identify new techniques to detect the ionospheric tsunami signature. [|#18#|][|#5#|][|#23#|]The Over-The-Horizon (OTH) radars recently proved to be able to measure seismic Rayleigh wave in the ionosphere, consequently we explore here numerically the possibility to detect the ionospheric signature of tsunamis. OTH operate in High Frequency (HF) band and can be used to monitor the bottomside ionosphere over large regions. Those regions can be strongly perturbed by tsunami generated IGW. We reproduce numerically those atmospheric/ionospheric waves as well as the effect that they produce on synthetic radar measurements. The effects of the tsunami directionality are analyzed underlining the radar capabilities to follow the ionospheric perturbations. The large coverage of OTH radar and its sensitivity to plasma anomalies open new perspectives in the future oceanic monitoring and tsunami warning systems.
Coïsson P.
Lognonné Philippe
Occhipinti Giovani
Rolland Lucie M.
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