Nancay RadioHeliograph

   NRH Nancay Radioheliograph operated by the Observatoire de Paris and funded by the French research agency CNRS/INSU. (for a detailed description, see A. Kerdraon & Delouis, 1997).
Contact person: A. Kerdraon

   The NRH, located at longitude 2 degrees east, latitude 47 north. NRH. consists of 44 antennas of size ranging from 2-10m, spread over two arms (EW and NS) with respective lengths of 3200 m and 2440 m. The EW and NS baselines are from 0 to 3200 m and 2440 m respectively . The minimum base line is 50 m. The NRH observes the 7h per day approximatively up to 10 frequencies between 150 and 450 MHz. The standard observing mode consists of Stokes I and V images at 164, 236, 327, 410 and 432 MHz each 150ms. The resolution of the 2 dimensional (2D) images depends on the frequency and the season. and is approximately 5.5 arcminute - 3.2 arcminute(164 MHz) and 2.2 arcminute- 1.25 arcminute (432 MHz) . The instrument also provides simultaneously 2 one dimensional images in the EW and NS direction with a spatial resolution of respectively about 1.2Õ and 3.2Õ at 164 MHz.

A. Kerdraon & J. M. Delouis, Coronal Physics from Radio and Space Observations; Proceedings of the CESRA Workshop held in Nouan le Fuzelier, France 3-7 June 1996, edited by Gerard Trottet, Published by Springer, 1997, p.192