Issue |
A&A
Volume 699, July 2025
|
|
---|---|---|
Article Number | A7 | |
Number of page(s) | 18 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361/202452444 | |
Published online | 01 July 2025 |
In-flight cross-calibration of HRIEUV/EUI and AIA/SDO
1
Solar-Terrestrial Centre of Excellence–SIDC, Royal Observatory of Belgium,
Ringlaan -3- Avenue Circulaire,
1180
Brussels,
Belgium
2
Centre Spatial de Liège, Université de Liège,
Av. du Pré-Aily B29,
4031
Angleur,
Belgium
3
Skobeltsyn Institute of Nuclear Physics, Moscow State University,
119991
Moscow,
Russia
4
Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale,
91405
Orsay,
France
5
Faculty of Aerospace Engineering, Delft University of Technology,
2600
Delft,
The Netherlands
★ Corresponding author: s.shestov@oma.be
Received:
1
October
2024
Accepted:
11
April
2025
Context. The extreme ultraviolet High-Resolution Imager (HRIEUV) of the Extreme Ultraviolet Imager (EUI) telescope on board Solar Orbiter observes the solar corona in an ~5 Å wide passband near 174 Å with unprecedented high spatial resolution.
Aims. We aim to perform radiometric cross-calibration of the HRIEUV and the Atmospheric Imaging Assembly (AIA) telescope in order to allow further mutual analyses of the observational data.
Methods. We applied a differential emission measure analysis using quasi-simultaneous images taken in seven spectral channels –HRIEUV and six channels of AIA – and compared the real and the simulated images.
Results. The comparison suggests that the real HRIEUV images have ~40% larger signal than the simulated images predicted by the differential emission measure analysis.
Conclusions. With our method we cannot conclude which instrument has errors in the absolute calibration, as it can be the case for either of them or both of them simultaneously, but to a lesser degree. However, in order to improve the accuracy of simultaneous data analysis, one needs to take this discrepancy into account. We see that introduction of the HRIEUV signal into the DEM analysis modifies the warm plasma with 1 MK. The ability of the method to reproduce HRIEUV images using only the AIA data further validates the underlying assumptions and our approach. Lastly, we believe the approach can be used as a strategy to establish a golden reference of contemporary EUV imagers.
Key words: techniques: photometric / telescopes / Sun: corona / Sun: UV radiation
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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