NOA Node

Location (town, country): Palaia Penteli, Greece

Central Web site:

Description of the infrastructure:

NOA Ionospheric node combines experimental ionospheric facilities, data e-infrastructures and modelling facilities.

NOA Ionospheric node operates a Digital Ionospheric Station (the Athens DPS4D; that performs vertical incidence sounding, drift measurements and bi-static operations with other DPS4D located in a distance of up to 1,500 km. The observations are automatically processed and archived and are provided with open access. The NOA Ionospheric node archive provides data for the last two solar cycles. The Athens Digisonde performs every 5 minutes VI, Drift and D2D operations, making the data set fully suitable for the investigation of both ionospheric storm effects and ionospheric instabilities such as sporadic E-layers, Spread F and Travelling Ionospheric Disturbances.

NOA Ionospheric node operates the European Digital Upper Atmosphere Server (DIAS that collects in real-time data from all Ionospheric Stations in Europe, and based on prediction models, provides nowcasts and forecasts of ionospheric characteristics over Europe, as well as predictions of thermospheric characteristics based on the International Reference Ionosphere (IRI) model and predictions of plasmaspheric electron density based on the Topside Sounder Model. The DIAS database contains data and model results from 2005 until today.

NOA Ionospheric node operates the TechTIDE-EC H2020 warning system ( that provides detection and prediction of Travelling Ionospheric Disturbances over Europe and Africa, based on several complementary methodologies that are based on the real-time processing of data from ionospheric sounders, GNSS receivers and CDSS system. An open access repository provides the software codes for the main TID detection methodologies. The system is still under development and will be delivered in June 2020.

Services currently offered by the infrastructure:

The NOA Ionospheric node systems offer a variety of services to research users: a) specification and forecast of ionospheric characteristics and ionospheric storm effects over Europe b) detection of medium and large scale travelling ionospheric disturbances over Europe and Africa c) access to NOA ionospheric databases with a Restful API that provides the results in an interoperable json format d) access to the sources codes of the main ionospheric forecast and electron density reconstruction models developed by the team.

According to Google Scholar, over 300 papers make reference to the Athens Digisonde and DIAS data. The TechTIDE software codes that have been released in 2019, have more than 200 downloads.

New areas opening to users:

  • Modeling of solar wind driven ionospheric storm effects.
  • Ensemble modeling for the prediction of ionospheric storm effects, using heliospheric forecasting models (for example EUHFORIA) and autoregression ionospheric prediction models such as the SWIF model.
  • Ensemble modeling for the prediction of ionospheric storm effects, using different training data sets.
  • Ionospheric reconstruction profilers ingesting GNSS, Digisonde and in situ electron density data from LEO satellites (such as CHAMP and Swarm).
  • Development of higher-level data-products based on ionospheric autoscaled data filtering algorithms.
  • Development of higher-level data products based on space-born and ground-based data detrending for the detection of Large Scale TIDs.
  • Models’ validation applying ESA SSA SWE validation process.