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Service and Products for ionosphere EleCtronic content and TRoposphere over Europe



Technical Group

Ionospheric Effects & Activity Forecast

SDA objective

  • To set up a pre-operational service for distribution of ionospheric electronic content products over Europe from GPS data.
  • To use equivalent systems in a laboratory context for the study of post-seismic ionospheric signals over California, Japan and the Mediterranean Sea.
  • To study the ability of dense GPS networks to monitor tsunami
  • To precise and consolidate technology applications and potential business outlets for ionosphere and troposphere products over Europe, in the framework of the preparation of GALILEO
  • To make this service evolve toward a pre-operational service for distribution of tropospheric products for GPS positioning
  • To support research in the field of tropospheric products applicable to meteorology, with the aim of having an operational production


  • Total Electron Content (TEC) 2D grids over Europe every 30 seconds, 15 minutes and 1 hour.
  • Slant TEC (TEC along Satellite-Station line-of-sight) at ionospheric percing points every 30 seconds.
  • Satellites and stations inter-frequency biases
Example of TEC values at ionospheric percing points Example of TEC grid contour

Link to Project WebSite

SDA description

The TEC service relies on GPS data from a dense network of stations over Europe. Primary 30 s data are processed so as to generate 2D maps of TEC that are available through an internet server. A particular attention is paid on the automation and reliability of the service. Maps are produced in slightly delayed mode (4 days) and are kept on line during one year. Extraction of off-line products are also achievable by direct request on the server.


The SPECTRE consortium is composed of a private company, NOVELTIS, and public research laboratories and institutes:

  • Institut de Physique du Globe de Paris (IPGP)
  • Centre d'Etude des Environnements Terrestre et Planétaires (CETP)
  • Eidgenössische Technische Hochschule Zürich (ETHZ)
  • Service d'Aéronomie (SA)
  • The following entities are observers of the project:

  • Laboratoire de géophysique, Tectonique et Sédimentologie -UMR 5573/U. Montpellier II
  • Centre National de Recherches Météorologiques (CNRM/Météo-France)
  • Laboratoire de Géophysique Interne et Tectonophysique - UMR5559/U. de Grenoble
  • Laboratoire de Recherche en Géodésie (IGN/LAREG)
  • Office National d'Etudes et de Recherches Aérospatiales (ONERA)
  • Commissariat à l'Energie Atomique, laboratoire de Détection et de Géophysique (CEA/DASE).
  • This project is also funded by the French Ministry of Research (Réseau Terre et Espace) and the French Space Agency CNES (TAOB).

    Contact / Manager

    Eric Jeansou

    Address: Noveltis 2, Avenue de l'Europe Parc Technologique du Canal F-31520 Ramonville Saint-Agne
    Telephone: +33 5 62 88 11 06
    Telefax: +33 5 62 88 11 10



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