LESIA Observatoire de Paris-PSL CNRS vopdc cdpp Sorbonne Université cnes Université de Paris

Nançay Decameter Array (NDA) Routine Solar Observation Data Collection V1.7

Monday 13 February 2023, by Baptiste Cecconi

This collection is composed of daily decametric observations of the Sun, using the Nançay Decametre Array, in Nançay, France.

Link to data


Decametric radio observation from Nançay Decameter Array (NDA) (Lamy et al. 2017). The NDA at the Station de Radioastronomie de Nancay (SRN) is a phased array of 144 "Teepee" helicoidal antenna, half of which being Right Handed (RH) polarized and the other half being Left Handed (LH) polarized. Four receivers are currently connected to the NDA, sampling data in spectral ranges within 5 to 80 MHz.


This collection contains the Solar observation data products, in two formats:

  • Raw data format (.RT1)
  • Common Data Format (.cdf)

See: Cecconi et al. (2020) for the complete CDF format specification of this collection.

Coverage and sampling

  • Time range: 1997 to now
  • Time resolution: 1 second.
  • Spectral range: 5 MHz to 85 MHz
  • Spectral sampling step: 75 kHz
  • Target: the Sun


The authors acknowledge the Nançay Radio Observatory / Unité Scientifique de Nançay of the Observatoire de Paris (USR 704-CNRS, supported by Université d’Orléans, OSUC, and Région Centre in France) for providing access to NDA observations.

BC was also supported by PADC and EPN2024-RI. The Europlanet 2024 Research Infrastructure (EPN2024-RI) project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 871149.


Any question or request should be addressed to contact.maser@obspm.fr


  • Cecconi, B., Masson, S., Coffre, A., Loh, A., Denis, L., & Lamy, L. (2020). SRN NDA Routine Sun EDR CDF Dataset Specification (Version 1.7). PADC/CDN. https://doi.org/10.25935/6GHG-SK80
  • Lamy, L., P. Zarka, B. Cecconi, L. Klein, S. Masson, L. Denis & A. Coffre (2017). 1977–2017: 40 years of decametric observations of Jupiter and the Sun with the Nançay Decameter Array, in Planetary Radio Emissions VIII, edited by G. Fischer et al., Austrian Academy of Sciences press, Vienna, 455–466. https://doi.org/10.1553/PRE8s455

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