Ionospheric perturbations observed by DEMETER in relation with the seismic activity

DEMETER is a low orbiting satellite (660 km) which was operating for more than six years to study ionospheric perturbations in relation with seismic activities. For this purpose, it recorded wave and plasma parameters all around the Earth (except in the auroral zones) at two different local times (10.30 and 22.30 LT). This paper will present examples of events observed prior to earthquakes. As the ionosphere is highly variable, the paper will also show statistical analysis performed on the ionospheric parameters during night time.