# The Solar Orbiter EUI instrument: The Extreme Ultraviolet Imager (Corrigendum)

P. Rochus, F. Auchère, D. Berghmans, L. Harra, W. Schmutz, U. Schühle, P.

Addison, T. Appourchaux, R. Aznar Cuadrado, D. Baker, et al.

► To cite this version:

P. Rochus, F. Auchère, D. Berghmans, L. Harra, W. Schmutz, et al. The Solar Orbiter EUI instrument: The Extreme Ultraviolet Imager (Corrigendum). Astronomy & Astrophysics - A&A, 2022, 665, 10.1051/0004-6361/201936663e. insu-03846982

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https://insu.hal.science/insu-03846982v1

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The Solar Orbiter mission

# The Solar Orbiter EUI instrument: The Extreme Ultraviolet Imager
## (Corrigendum)

P. Rochus¹, F. Auchère², D. Berghmans³, L. Harra⁴, W. Schmutz⁵, U. Schühle⁶, P. Addison⁴, T. Appourchaux²,
R. Aznar Cuadrado⁶, D. Baker⁴, J. Barbay², D. Bates⁴, A. BenMoussa³, M. Bergmann⁶, C. Beurthe⁷, B. Borgo²,
K. Bonte³, M. Bouzit², L. Bradley⁴, V. Büchel⁵, E. Buchlin², J. Büchner⁶, F. Cabé², L. Cadiergues⁹, M. Chaigneau²,
B. Chares⁶, C. Choque Cortez², P. Coker⁴, M. Condamin², S. Coumar⁷, W. Curdt⁶, J. Cutler⁴, D. Davies⁴,
G. Davison⁴, J.-M. Defise¹, G. Del Zanna⁸, F. Delmotte⁷, V. Delouille³, L. Dolla³, C. Dumesnil², F. Dürig⁵, R. Enge⁶,
S. François², J.-J. Fourmond², J.-M. Gillis¹, B. Giordanengo³, S. Gissot³, L. M. Green⁴, N. Guerreiro⁵, A. Guilbaud⁷,
M. Gyo⁵, M. Haberreiter⁵, A. Hafiz⁴, M. Hailey⁴, J.-P. Halain¹, J. Hansotte², C. Hecquet⁷, K. Heerlein⁶,
M.-L. Hellin¹, S. Hemsley⁴, A. Hermans¹, V. Hervier², J.-F. Hochedez³, Y. Houbrechts¹, K. Ihsan⁴, L. Jacques¹,
A. Jérôme⁷, J. Jones⁴, M. Kahle⁶, T. Kennedy⁴, M. Klaproth⁶, M. Kolleck⁶, S. Koller⁵, E. Kotsialos⁴, E. Kraaikamp³,
P. Langer⁵, A. Lawrenson⁴, J.-C. Le Clech¹, C. Lenaerts¹, S. Liebecq¹, D. Linder⁴, D. M. Long⁴, B. Mampaey³,
D. Markiewicz-Innes⁶, B. Marquet¹, E. Marsch⁶, S. Matthews⁴, E. Mazy¹, A. Mazzoli¹, S. Meining⁶,
E. Meltchakov⁷, R. Mercier⁷, S. Meyer⁶, M. Monecke⁶, F. Monfort¹, G. Morinaud², F. Moron⁷, L. Mountney⁴,
R. Müller⁶, B. Nicula³, S. Parenti²,³, H. Peter⁶, D. Pfiffner⁵, A. Philippon², I. Phillips⁴, J.-Y. Plesseria¹, E. Pylyser³,
F. Rabecki¹, M.-F. Ravet-Krill⁷, J. Rebellato⁷, E. Renotte¹, L. Rodriguez³, S. Roosevelt¹, J. Rosin¹, L. Rossi¹, P. Roth⁷,
F. Rouesnel², M. Roulliyay⁷, A. Rousseau⁴, K. Ruane⁴, J. Scanlan⁴, P. Schlatter⁵, D. B. Seaton³,*, K. Silliman⁴,
S. Smit⁴, P. J. Smith⁴, S. K. Solanki⁶, M. Spescha⁵, A. Spencer⁴, K. Stegen³, Y. Stockman¹, N. Szwec², C. Tamiatto²,
J. Tandy⁴, L. Teriaca⁶, C. Theobald⁴, I. Tychon¹, L. van Driel-Gesztelyi⁴, C. Verbeeck³, J.-C. Vial², S. Werner⁶,
M. J. West³, D. Westwood⁴, T. Wiegelmann⁶, G. Willis⁴, B. Winter⁴, A. Zerr⁶, X. Zhang², and A. N. Zhukov³

¹ Centre Spatial de Liège, Université de Liège, Av. du Pré-Aily B29, 4031 Angleur, Belgium

² Institut d'Astrophysique Spatiale, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Bât. 121, 91405 Orsay, France

³ Royal Observatory of Belgium, Ringlaan 3 Av. Circulaire, 1180 Brussels, Belgium
e-mail: david.berghmans@oma.be

⁴ UCL-Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK

⁵ Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, 7260, Davos Dorf, Switzerland

⁶ Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany

⁷ Laboratoire Charles Fabry, Institut d'Optique Graduate School, Université Paris-Saclay, 91127 Palaiseau Cedex, France

⁸ Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK

⁹ Centre National d'Etudes Spatiales, 18 avenue Edouard Belin, 31401 Toulouse Cedex 9, France

A&A, 642, A8 (2020), https://doi.org/10.1051/0004-6361/201936663

**Key words.** Sun: UV radiation – Sun: transition region – Sun: corona – space vehicles: instruments – instrumentation: high angular resolution – errata, addenda

This erratum concerns the relative spectral response of the HRI<sub>Lya</sub> Telescope published in the Solar Orbiter EUI Instrument article (Rochus et al. 2020). It corrects Fig. 24 in Sect. 8.2 of the original manuscript. The published figure was included by mistake, as it showed the response of only part of the optical chain and did not provide the relative response of the entire HRI<sub>Lya</sub> Telescope. The difference between the two computed responses is significant because the spectral purity of the band-pass and long-wavelength suppression of the solar continuum was an explicit design driver of the instrument.

The corrected figure, which shows the achieved rejection of longer wavelengths (by many orders of magnitude), is provided in this corrigendum. Figure 1 shows the relative spectral response between 115 nm and 300 nm, predicted by the measurements of all flight components (mirrors, filters, and detector). We note that the peak of the response is shifted by 2.6 nm with respect to the Lyman-α rest wavelength as a result of the narrow-band focal plane filter, which has its maximum transmittance at 119 nm.

## References

<footnote>* Now at: CIRES, University of Colorado, Boulder, CO, USA</footnote>

<footnote>Rochus, P., Auchère, F., Berghmans, D., et al. 2020, A&A, 642, A8</footnote>
<figure><img src="image_2.png" /><figcaption>**Fig. 1.** Relative spectral response of HRI<sub>Lya</sub> as predicted by the measured efficiencies of all flight components (mirrors, filters, and the detector).</figcaption></figure>