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Four Decades of Advances from MSDP to S4I and SLED Imaging Spectrometers

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Abstract

The Multichannel Subtractive Double Pass (MSDP) is an imaging spectroscopy technique, which allows observations of spectral line profiles over a 2D field of view with high spatial and temporal resolution. It has been intensively used since 1977 on various spectrographs (Meudon, Pic du Midi, the German Vacuum Tower Telescope, THEMIS, Wrocław). We summarize previous developments and describe the capabilities of a new design that has been developed at Meudon and that has higher spectral resolution and increased channel number: Spectral Sampling with Slicer for Solar Instrumentation (S4I), which can be combined with a new and fast polarimetry analysis. This new generation MSDP technique is well adapted to large telescopes. Also presented are the goals of a derived compact version of the instrument, the Solar Line Emission Dopplerometer (SLED), dedicated to dynamic studies of coronal loops observed in the forbidden iron lines, and prominences. It is designed for observing total solar eclipses, and for deployment on the Wrocław and Lomnicky peak coronagraphs respectively for prominence and coronal observations.

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Acknowledgements

We thank the referee for helpful comments and suggestions. We are indebted to Ch. Coutard, R. Hellier, A. Miguel for the achievement of MSDP instruments, and to Dr B. Schmieder and Dr N. Mein for organizing and carrying out many observing campaigns. We thank also D. Crussaire and R. Lecocguen for their technical assistance, and the Pôle Instrumental of the GEPI department (Observatoire de Paris). We are grateful for financial support to the Institut National des Sciences de l’Univers (INSU/CNRS), the Programme National Soleil Terre (INSU/PNST), the University of Wrocław, the UK Science and Technology Facilities Council (STFC) and Queen’s University Belfast.

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Authors and Affiliations

  1. LESIA, Observatoire de Paris, 92195, Meudon, Paris, France

    P. Mein & J.-M. Malherbe

  2. PSL Research University, Paris, France

    P. Mein, J.-M. Malherbe & F. Sayède

  3. GEPI, Observatoire de Paris, 92195, Meudon, Paris, France

    F. Sayède

  4. Wrocław University, Wrocław, Poland

    P. Rudawy

  5. Earth Sciences Department, Natural History Museum, London, SW75BD, UK

    K. J. H. Phillips

  6. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University, Belfast, UK

    F. P. Keenan

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  1. P. Mein
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Supplementary Information.

  1. i)

    Movie (MPEG 4 format): a typical sequence of a solar scan with S4I in polarimetric mode (25 successive images using a beam shifter are recorded for a final 300″ × 150″ FOV; each image presents 18 couples of sub-channels I+V, I–V. Each sub-channel covers 300″ × 7.5″). First part of the movie: Mg i 5173 Å line; second part: Ca ii 8542 Å line.

  2. ii)

    MSDP full bibliography from 1977 to now (PDF format, including URLs of the cited papers).

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Mein, P., Malherbe, JM., Sayède, F. et al. Four Decades of Advances from MSDP to S4I and SLED Imaging Spectrometers. Sol Phys 296, 30 (2021). https://doi.org/10.1007/s11207-021-01766-9

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