The New 2018 Version of the Meudon Spectroheliograph
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Daily full-disk observations of the solar photosphere and chromosphere started at the Meudon Observatory in 1908. After a review of the scientific context and the historical background, we describe the instrumental characteristics and capabilities of the new version operating since 2018. The major change is the systematic recording of full line profiles over the entire solar disk providing 3D data cubes. Spectral and spatial sampling are both improved. Classical 2D images of the Sun at fixed wavelength are still delivered. We summarize the different processing levels of on-line data and briefly review the new scientific perspectives.
KeywordsPhotosphere Chromosphere Spectroheliograph Full-sun Long-term observations
This article is dedicated to the memory of E. Ribes who directed Meudon solar observations for many years and passed away at an early age in 1996.
We thank the reviewer for helpful comments and suggestions. We are also indebted to the technical staff of LESIA (D. Crussaire, N. Füller, C. Imad, M. Ortiz, C. Renié, and D. Ziegler) and to the team of observers who operate daily the instrument (C. Blanchard, I. Bualé, S. Cnudde, A. Docclo, I. Ibntaieb). We are grateful to the Scientific Council of the Paris Observatory for financial support and INSU/CNRS for the label of National Observing Service (SNO). K. Dalmasse is supported by the Centre National d’Etudes Spatiales (CNES).
Disclosure of Potential Conflicts of Interest
The authors declare that they have no conflicts of interest.
- Schrijver, C.J., Beer, J., Baltensperger, U., Cliver, E.W., Güdel, M., Hudson, H.S., McCracken, K.G., Osten, R.A., Peter, T., Soderblom, D.R., Usoskin, I.G., Wolff, E.W.: 2012, Estimating the frequency of extremely energetic solar events, based on solar, stellar, lunar, and terrestrial records. J. Geophys. Res. (Space Phys.) 117, A08103. DOI. ADS. ADSCrossRefGoogle Scholar