@InProceedings{KheraniRolLogSlaPau:2015:CaSt,
author = "Kherani, Esfhan Alam and Rolland, L. and Lognonne, Philippe and
Sladen, A. and Paula, Eurico Rodrigues de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and {}
and {} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Traveling ionosphere disturbances excited ahead of the Tohoku-Oki
tsunami: a case study",
year = "2015",
organization = "International Congress of the Brazilian Geophysical Society, 14.",
abstract = "We document two kinds of traveling ionospheric disturbances,
namely, CTIDs (Co-tsunami-TravelingIonospheric-disturbances) and
ETIDs
(Early-Arrivalthan-Tsunami-Traveling-Ionospheric-disturbances)
related to the Tohoku-Oki tsunami of 11 March 2011. They are,
respectively, referred to the disturbances that remain behind and
ahead of the principal tsunami wave-front. We first note their
presence in a numerical experiment performed using a simulation
code coupling the tsunami, atmosphere and ionosphere. This code
uses the tsunami wave-field as an input and simulates
Acoustic-Gravity Waves (AGWs) in the atmosphere and TIDs, in the
form of total electron content (TEC) disturbance, in the
ionosphere. The simulated TEC reveals the excitation of CTIDs (at
about 2 TECU) and ETIDs (at about 1 TECU), representing up to 5%
disturbance over the ambient electron density, and they arise from
the dissipation of the AGWs in the thermosphere. A novel outcome
is that the strong ETIDs are excited about 20-60 minutes earlier
(than the tsunami arrival time) at a location which is about 3o
-10o ahead of the instantaneous location of the principal tsunami
wave-front. Simulation results are compared with the far-field
observations using GNSS satellites and in both, ETIDs are
identified as the secondary TEC maximum, occurring 20-40 minutes
before the tsunami arrival while the primary TEC maximum
representing the CTIDs occurs 10-45 minutes after the tsunami
arrival. The ETIDs reported in this study are a new kind of TIDs
whose characteristics can be potentially used for the early
warning of the tsunami.",
conference-location = "Rio de Janeiro, RJ",
conference-year = "3-6 Aug.",
urlaccessdate = "28 mar. 2024"
}