Simulation of seismo-ionospheric effects initiated by internal gravity waves |
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Authors: | M V Klimenko V V Klimenko I V Karpov I E Zakharenkova |
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Institution: | 1.West Department of Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Waves Propagation,Russian Academy of Sciences,Kaliningrad,Russia;2.Kaliningrad State Technical University,Kaliningrad,Russia |
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Abstract: | Experimental studies have repeatedly demonstrated that, a few days before a strong earthquake, local increases (sometimes
decreases) in the electron density in the ionosphere over the epicentral area emerge. Simulations with the help of the GSM
TIP (global self-consistent model “Thermosphere-Ionosphere-Protonosphere”) and UAM (Upper Atmosphere Model) models show that
account of local disturbances of the zonal electric fields makes it possible to reproduce the morphology of ionospheric disturbances.
However, these model experiments do not explain the formation of such ionospheric features over the epicentral area of the
impending earthquake. In this paper, we propose a mechanism for the formation of ionospheric disturbances before strong earthquakes
due to propagation and dissipation of small-scale internal gravity waves (IGWs) in the upper atmosphere. Using the GSM TIP
model, we calculated the ionospheric parameters with account of small-scale IGWs in the near-epicenter area. It is shown that
disturbances in the TEC (total electron content) predicted by calculations are in satisfactory agreement with observations
from GPS (Global Position System) satellites before the strong mid-latitude earthquake in Greece on January 8, 2006. |
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