National Observatory of Athens (NOA)

Infrastructure or equipment
The TechTIDE NOA team, operates a prototype system for the identification of TIDs (the Net-TIDE detection and warning system) that it is based on observations retried from synchronised DPS4D stations, exploiting HF skywave Doppler frequency and angle-of-arrival measurements, that provides an overview of the TID activity over Europe. The final version of the Net-TIDE prototype service will be released in 2017 ( spsionosphere/).
Since 2006, the TechTIDE NOA team operates the DIAS (European Digital Upper Atmosphere Server) infrastructure, which provides alerts, nowcasts and forecasts for ionospheric conditions. The service is based on data from ten European Digisondes and ionosondes, TEC data from the EUREF network and supporting data from the solar wind data from ACE mission and geomagnetic stations from the global networks. The DIAS portal is accessible at, where all products are updated every 15 minutes. In 2013, the DIAS database was registered in ESPAS/FP7-RI platform as one of the main repositories for ground-based ionospheric data and supportive data sets from satellite missions (Demeter, ISIS, Alouette) and reference models (IRI2012).
The team operates the Athens Digisonde since 2000. It was recently upgraded to a DPS4D and all data and value added products are accessible from In addition to the routine ionospheric measurements, the Athens Digisonde performs oblique drift measurements in synchronous operation with other Digisondes DPS4D for the detection of Doppler and angle of arrival perturbations inferred by TIDs.
Based on DIAS infrastructure, NOA developed the European Ionosonde Service (, which was selected as one of the federated services that support the pilot of the Space Situational Awareness Programme of the European Space Agency.

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