Geomagnetic dependence of ionospheric disturbances induced by tsunamigenic internal gravity waves

Details Geomagnetic dependence of ionospheric disturbances induced by tsunamigenic internal gravity waves Geomagnetic dependence of ionospheric disturbances induced by tsunamigenic internal gravity waves

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.s41d..08k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #S41D-08

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0500 Computational Geophysics (3200, 3252, 7833), 2427 Ionosphere/Atmosphere Interactions (0335), 3339 Ocean/Atmosphere Interactions (0312, 4504), 4564 Tsunamis And Storm Surges, 5440 Magnetic Fields And Magnetism

Scientific paper

A series of ionospheric anomalies following the Sumatra tsunami has been recently reported in the literature (Liu et al. 2006; DasGupta et al. 2006; Occhipinti et al. 2006). These anomalies show the signature in the ionosphere of tsunami-generated internal gravity waves (IGW) propagating in the neutral atmosphere overlooking the ocean. All these anomalies, observed in the total electron content (TEC) measured by GPS or altimeters, show geographical heterogeneity in the perturbed TEC amplitude and suggest a dependence of geomagnetic latitude. This latter, never treated theoretically, have been taken into account in the 3D modeling of Occhipinti et al. (2006) and used for the interpretation of the TEC Topex and Jason data. The same quantitative modeling is used here to focus on both, the magnetic field dependence and the geometrical properties of the tsunami wave. The etherogenity produced in the ionosphere by a north-ward and south-ward tsunami propagation propagation in the global scale is presented here in term of TEC perturbations. The sensitivity of both altimeters and base-ground GPS is analyzed and the modeling results are used to discuss the role of ionospheric sounding in the future oceanic monitoring and tsunami warning system. [DasGupta et al., 2006] Earth Planet. Space, 35, 929-959. [Liu et al., 2006] J. Geophys. Res., 111, A05303. [Occhipinti et al., 2006] Geophys. Res. Lett., 33, L20104, 2006

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