Athens, Greece

The Ionospheric Group of the National Observatory of Athens operates the Athens Digisonde (URSI code: AT138), one of the most advanced European real-time ionospheric stations, a Digisonde Portable Sounder - 4D (DPS-4D) at Penteli site since September 2000. The Athens Digisonde performs 5-minute scheduled observations with vertical incidence ionograms and ionospheric plasma drifts. The Athens Digisonde is part of the European Ionosonde Network DIAS (European Digital upper Atmosphere Server) and part of the Global Network GIRO (Global Ionospheric Radio Observatory), operated by the University of Massachusetts Lowell. The Athens Digisonde observations support the European Ionospheric Service (EIS) of the European Space Agency (ESA) Space Weather Service Network.