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The Solar Line Emission Dopplerometer project

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Abstract

Observations of the dynamics of solar coronal structures are necessary to investigate space weather phenomena and global heating of the corona. The profiles of high temperature lines emitted by the hot plasma are usually integrated by narrow band filters or recorded by classical spectroscopy. We present in this paper details of a new transportable instrument (under construction) for imaging spectroscopy: the Solar Line Emission Dopplerometer (SLED). It uses the Multi-channel Subtractive Double Pass (MSDP) technique, which combines the advantages of both filters and narrow slit spectrographs, i.e. high temporal, spatial and spectral resolutions. The SLED will measure at high cadence (1 Hz) the line-of-sight velocities (Doppler shifts) of hot coronal loops, in the forbidden lines of FeX 6374 Å and FeXIV 5303 Å. It will follow the dynamics of fast evolving events of solar activity such as flares or Coronal Mass Ejections (CMEs), and also study coronal heating by short period waves. Observations will be performed with the coronagraph at the Lomnický Štít Observatory (LSO, in Slovakia) or during total eclipses. The SLED will also observe the dynamics of solar prominences in Hα 6563 Å or He D3 5876 Å lines when mounted on the Białków coronagraph (near Wrocław, Poland). It is fully compatible with polarimetric measurements by various techniques.

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Acknowledgements

The authors thank the referee for helpful comments and suggestions. We are grateful for financial support to the Institut National des Sciences de l’Univers (INSU/CNRS), the University of Wrocław, the UK Science and Technology Facilities Council (STFC), the Leverhulme Trust via grant RPG-2019-371, and Queen’s University Belfast. J.R. acknowledges support by the Science Grant Agency project VEGA 2/0048/20 (Slovakia). P. Rudawy was supported by the National Science Centre in Poland, under grant No. UMO-2015/17/B/ST9/02073.

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Authors and Affiliations

  1. LESIA, Observatoire de Paris, PSL Research University, CNRS, 92195, Meudon, France

    Jean-Marie Malherbe & Pierre Mein

  2. GEPI, Observatoire de Paris, PSL Research University, CNRS, 92195, Meudon, France

    Frédéric Sayède

  3. Astronomical Institute, University of Wrocław, Wrocław, Poland

    Pawel Rudawy

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

    Kenneth Phillips

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

    Francis Keenan

  6. Astronomical Institute, Slovak Academy of Sciences, 05960, Tatranská Lomnica, Slovakia

    Jan Rybák

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  1. Jean-Marie Malherbe
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Malherbe, JM., Mein, P., Sayède, F. et al. The Solar Line Emission Dopplerometer project. Exp Astron 53, 83–101 (2022). https://doi.org/10.1007/s10686-021-09804-x

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