HR: 13:55h
AN: T53C-02 INVITED     [Abstracts]
TI: First Results Obtained With the Micro-Satellite DEMETER
AU: * Parrot, M
EM: mparrot@cnrs-orleans.fr
AF: LPCE/CNRS, 3A Avenue de la Recherche, ORLEANS, 45100 France
AB: Among all earthquake precursors, those related to electromagnetic effects are the most puzzling, and the many possible sources of noise are cause of lively controversies. A large number of laboratory experiments clearly suggest that micro-fracturing is associated with the appearance of spontaneous charge production (electrification) and transient Electric or ElectroMagnetic (EM) Emission. Other hypotheses to explain these electromagnetic effects are related to fluid circulation in the crust, gas emanation, acoustic-gravity waves,.Many electric and magnetic pre-seismic and co-seismic effects have been reported in the past as well as ionospheric perturbations. DEMETER is a micro-satellite dedicated to the study of such perturbations in order to understand their generation mechanisms. DEMETER has been launched by CNES at the end of June 2004. The aim of this paper is to describe the scientific objectives of this mission and all possible means to achieve these objectives. The payload of the DEMETER microsatellite allow to measure waves and also some important plasma parameters (ion composition, electron density and temperature, energetic particles). The scientific payload is composed of several sensors: - Three electric and three magnetic sensors (6 components of the electromagnetic field to investigate from DC up to 3.5 MHz), - A Langmuir probe, - An ion spectrometer, and, - An energetic particle analyzer. There are two modes of operation: (i) a survey mode to record low bit rate data all around the Earth, and (ii) a burst mode to record high bit rate data above seismic regions. Data are processed in a mission center and are available for scientific users from a web site located in Orleans. The first results obtained from DEMETER will be shown.
UR: http://demeter.cnrs-orleans.fr
DE: 7223 Seismic hazard assessment and prediction
DE: 6934 Ionospheric propagation (2487)
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 2435 Ionospheric disturbances
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting