The present web site is brought to you by the LESIA , UMR 8109, Observatoire de Paris-Meudon and is made possible thanks to a grant from the french Space Agency CNES.

This radio survey project is a joint effort of the Paris Observatory, the Yunnan Observatory (China), the University of Sydney (Australia), the University of Athens, the University of Ioannina (Greece), the Solar Physics Branch of the Naval Research Laboratory (USA), The Royal Observatory of Belgium and the Indian Institute of Astrophysics (Gauribidanur).

The primary goal of the project is to support multi-wavelength data analysis and space missions dedicated to research on solar activity and on solar-terrestrial relationships, more particularly the SOHO, STEREO, SDO and Parker Solar Probe missions.

This site provides daily surveys which include :

• Radio spectra covering a large frequency range obtained by combining data sets from : Orfees and NDA (Nançay France), YNAO (Yunnan,China), Culgoora or Learmonth (Australia), Artemis (Thermopyle, Greece), GLOSS (Gauribidanur, India), ARCAS and HSRS (Humain, Belguim), spectrographs from WIND and STEREO missions.
• Processed Radio imaging at two frequencies and access to multi-frequency data from the Nançay Radioheliograph (NRH) providing files readable by Solar Soft.
• Coronal Mass Ejections (CMEs) occurrences observed by SOHO and STEREO.