HR: 0800h
AN: GP41D-09    [Abstracts]
TI: Study of ionospheric perturbations observed by the satellite DEMETER during seismic activity
AU: * PARROT, M
EM: mparrot@cnrs-orleans.fr
AF: Michel Parrot, LPCE/CNRS, Orleans, 45071, France
AB: DEMETER is an ionospheric micro-satellite launched on a polar orbit at an altitude of 710 km. Its main scientific objective is to study the ionospheric perturbations in relation with seismic activity, and then, its scientific payload allows to measure electromagnetic waves and plasma parameters all around the Earth except in the auroral zones. Two specific parameters are taken into account in this paper: the electron density and the electrostatic turbulence. As the ionosphere is highly variable and mainly under the control of the sun, only a statistical analysis of the data is able to show if there is an effect of the seismic activity in the ionosphere. A statistical study has been set about the variation of these parameters during the seismic activity. As the data base is now increasing it is possible to check the results when more and more events are added. The statistic is done as functions of the geographic position, the local time, and the magnetic activity. Geographical maps with average data are obtained to be used as background levels, and the superposed epoch method is applied to merge the data recorded during seismic activity. Comparison is done when we remove the aftershocks from the statistics.
DE: 2435 Ionospheric disturbances
DE: 2439 Ionospheric irregularities
DE: 7223 Earthquake interaction, forecasting, and prediction (1217, 1242)
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly