%0 Journal Article %T Study of the TEC data obtained from the DORIS stations in relation to seismic activity %+ Laboratoire de physique et chimie de l'environnement (LPCE) %A Li, F. %A Parrot, Michel %< avec comité de lecture %@ 1593-5213 %J Annals of Geophysics %I Istituto Nazionale di Geofisica e Vulcanologia (INGV) %V 50 %N 1 %P 12 pages %8 2007 %D 2007 %K total electron content %K seismic activity %K ionosphere %Z Sciences of the Universe [physics]Journal articles %X Ionospheric data obtained from the DORIS system are used in this paper. The DORIS system is composed ofseveral ground-based beacons which emit at two frequencies (400 MHz and 2 GHz) and of receivers on boardseveral satellites (currently SPOT2, SPOT4, SPOT5, Topex-Poseidon, Jason1 and Envisat). Thanks to the densityof its network coverage (?50 stations), DORIS provides information on the ionosphere. The TEC (Total ElectronContent) parameter which is the electron density integrated over the vertical could be obtained from DORISmeasurements. In a first step, the paper describes the way to obtain the TEC data from the DORIS ionosphericmeasurements, and comparisons of the results are done with the IRI2001 model. In a second step, TEC valuesare used to search for correlation between ionospheric perturbations and seismic activity. Earthquakes of magnitudelarger than 5 are chosen close to the ground-based DORIS stations. Among other results, the statisticsshow that, during the night time and at geomagnetic latitude close to the equator (<10°), TEC amplitude fluctuatesat the time of the earthquakes as it is expected, but also 2 days and 5 days before. %G English %2 https://insu.hal.science/insu-03233598/document %2 https://insu.hal.science/insu-03233598/file/3086-Article%20Text-3189-1-10-20091218.pdf %L insu-03233598 %U https://insu.hal.science/insu-03233598 %~ INSU %~ CNRS %~ UNIV-ORLEANS %~ OSUC %~ LPC2E %~ TEST3-HALCNRS