New about Nancay Radioheliograph
We wish you a happy year 2021, and are pleased to announce that the upgrade of the Nancay Radioheliograph (NRH), which caused an interruption of observations since January 2015, has been completed. We started solar observations again in November 2020. For now the NRH operates in manual mode during working hours, with the aim to validate the system and the software. Observations that we consider exploitable are visible on the present web site and can be accessed through the Radio Solar Database. Please be aware that these observations are conducted with a restricted set of antennas and have not been fully validated. We hope to have a fully operational instrument in March, observing the Sun 7-8 hours per day every day as it used to do before 2015.
New radio solar database
The process to request Nancay data (NRH and ORFEES) has been changed. After clicking on Get Nancay Data button you will be redirected on the Solar Radio Data Base @ Nancay webpage. This data base provides more flexibility and efficiency for data request.


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.