Summary
International Symposium on Antennas and Propagation
2008
Session Number:4A12
Session:
Number:4A12-2
Tsunami Detection Using Ionosphere Tomography
Chao-Lun Mai, Jean-Fu Kiang,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
A tsunami can launch atmospheric internal gravity waves (IGWs) into the neutral atmosphere and create large disturbances in the ionosphere. As the tsunami propagates on the open sea, it forces the air particles to vibrate, generating a pressure difference, and hence the IGWs. Through ion-neutral collision, chemical loss, and photoionization, electron irregularity is induced in the passage of the gravity waves. These atmospheric perturbations have been observed by means of Doppler radar or weather satellites. However, the observed data were recorded in local regions or in an one-dimentional pattern along the satellite orbital track. Computerized tomography (CT) techniques can be used to generate a three-dimentional image of electron density in the ionosphere using the satellite becon data on transionospheric total electron content (TEC) recorded sumultaneously at multiple ground stations. This technique provides a cost-effective way to monitor the ionosphere, and can be used to dectect tsunami at early stage.