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  Cosmic-ray flux predictions and observations for and with Metis on board Solar Orbiter

Grimani, C., Andretta, V., Chioetto, P., Da Deppo, V., Fabi, M., Gissot, S., et al. (2021). Cosmic-ray flux predictions and observations for and with Metis on board Solar Orbiter. Astronomy and Astrophysics, 656: A15. doi:10.1051/0004-6361/202140930.

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Grimani, C., Author
Andretta, V., Author
Chioetto, P., Author
Da Deppo, V. , Author
Fabi, M., Author
Gissot, S., Author
Naletto, G., Author
Persici, A., Author
Plainaki, C., Author
Romoli, M., Author
Sabbatini, F., Author
Spadaro, D., Author
Stangalini, M., Author
Telloni, D., Author
Uslenghi, M., Author
Antonucci, E., Author
Bemporad, A., Author
Capobianco, G., Author
Capuano, G., Author
Casti, M., Author
De Leo, Yara1, Author              Fineschi, S., AuthorFrassati, F., AuthorFrassetto, F., AuthorHeinzel, P., AuthorJerse, G., AuthorLandini, F., AuthorLiberatore, A., AuthorMagli, E., AuthorMesserotti, M., AuthorMoses, D., AuthorNicolini, G., AuthorPancrazzi, M., AuthorPelizzo, M. G., AuthorRomano, P., AuthorSasso, C., AuthorSchühle, Udo1, Author              Slemer, A., AuthorStraus, T., AuthorSusino, R., AuthorTeriaca, Luca1, Author              Volpicelli, C. A., AuthorFreiherr von Forstner, J. L. , AuthorZuppella, P., Author more..
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              


Free keywords: cosmic rays / solar-terrestrial relations / instrumentation: detectors
 Abstract: Context. The Metis coronagraph is one of the remote sensing instruments hosted on board the ESA/NASA Solar Orbiter mission. Metis is devoted to carry out the first simultaneous imaging of the solar corona in both visible light (VL) and ultraviolet (UV). High-energy particles can penetrate spacecraft materials and may limit the performance of the on-board instruments. A study of the galactic cosmic-ray (GCR) tracks observed in the first VL images gathered by Metis during the commissioning phase is presented here. A similar analysis is planned for the UV channel. Aims. We aim to formulate a prediction of the GCR flux up to hundreds of GeV for the first part of the Solar Orbiter mission to study the performance of the Metis coronagraph. Methods. The GCR model predictions are compared to observations gathered on board Solar Orbiter by the High-Energy Telescope in the range between 10 MeV and 100 MeV in the summer of 2020 as well as with the previous measurements. Estimated cosmic-ray fluxes above 70 MeV n−1 have been also parameterized and used for Monte Carlo simulations aimed at reproducing the cosmic-ray track observations in the Metis coronagraph VL images. The same parameterizations can also be used to study the performance of other detectors. Results. By comparing observations of cosmic-ray tracks in the Metis VL images with FLUKA Monte Carlo simulations of cosmic-ray interactions in the VL detector, we find that cosmic rays fire only a fraction, on the order of 10−4, of the whole image pixel sample. We also find that the overall efficiency for cosmic-ray identification in the Metis VL images is approximately equal to the contribution of Z ≥ 2 GCR particles. A similar study will be carried out during the whole of the Solar Orbiter’s mission duration for the purposes of instrument diagnostics and to verify whether the Metis data and Monte Carlo simulations would allow for a long-term monitoring of the GCR proton flux.


Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/202140930
 Degree: -



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Source 1

Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 656 Sequence Number: A15 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1