EGU2020-7650 https://doi.org/10.5194/egusphere-egu2020-7650 EGU General Assembly 2020 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. PECASUS - ICAO Designated Space Weather Service Network for Aviation Harri Haukka 1 , Ari-Matti Harri 1 , Kirsti Kauristie 1 , Jesse Andries 2 , Mark Gibbs 3 , Peter Beck 4 , Jens Berdermann 5 , Loredana Perrone 6 , Bert van den Oord 7 , David Berghmans 8 , Nicolas Bergeot 2 , Erwin De Donder 9 , Martin Latocha 10 , Mark Dierckxsens 9 , Haris Haralambous 11 , Iwona M Stanislawska 12 , Volker Wilken 5 , Vincenzo Romano 13 , Martin Kriegel 5 , and Kari Österberg 1 1 Finnish Meteorological Institute, Space Research and Observation Technologies, Helsinki, Finland (harri.haukka@fmi.fi) 2 Royal Observatory of Belgium, Brussels, Belgium 3 Met Office, Exeter, United Kingdom 4 Seibersdorf Laboratories Inc, Vienna, Austria 5 German Aerospace Center Neustrelitz, Neustrelitz, Germany 6 Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy 7 Royal Netherlands Meteorological Institute, De Bilt, Netherlands 8 Solar-Terrestrial Centre of Excellence, Leuven, Belgium 9 Belgisch Instituut voor Ruimte-Aeronomie, Brussel, Belgium 10 Sebersforf Laboratories Inc., Vienna, Austria 11 Frederick University Cyprus, Nicosia, Cyprus 12 Space Research Center Polish Academy of Sciences, Warszawa, Poland 13 SpacEarth Technology, Rome, Italy The PECASUS Consortium (European Consortium for Aviation Space weather User Services) provides targeted space weather services focusing on the dissemination of warning messages, called 'advisories', towards aviation actors. PECASUS services corresponds to extreme space weather events with impact on aviation GNSS systems, HF communication and radiation levels at flight altitudes. In November 2018 ICAO (International Civil Aviation Organization) designated three global space weather service centers. These centers acre operated by the European PECASUS consortium, by United States and by the consortium of Australia, Canada, France and Japan. PECASUS was set-up as a consortium bringing together a number of European partners with proven space weather service capabilities. The PECASUS consortium is coordinated by FMI (Finland) who is also the ultimate responsible for communications towards the aviation sector. The Advisory Messages are produced by STCE (Belgium) on the basis of expert interpretation and data streams produced by DLR (Germany), INGV (Italy), Seibersdorf Laboratories (Austria), STCE (Belgium), SRC (Poland) and FU (Cyprus). In addition, the MetOffice (UK) will act as a resilience node in case of a major failure in the network, while the KNMI (The Netherlands) will take care of user liaison and monitor the PECASUS performance. The PECASUS Consortium was audited in February 2018 by space weather and operational