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International Conference on Space Optics — ICSO 2014

DOI: 10.1117/12.2304274

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METIS: the visible and UV coronagraph for Solar Orbiter

Journal article published in 2014 by F. Landini, E. Antonucci, V. Andretta ORCID, A. Berlicki, S. Fineschi, G. Nicolini, L. Teriaca, S. Pucci, L. Abbo, G. Capobianco ORCID, D. Telloni, F. Frassetto, M. Romoli, J. D. Moses, G. Naletto and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

METIS coronagraph is designed to observe the solar corona with an annular field of view from 1.5 to 2.9 degrees in the visible broadband (580-640 nm) and in the UV HI Lyman-alpha, during the Sun close approaching and high latitude tilting orbit of Solar Orbiter. The big challenge for a coronagraph is the stray light rejection. In this paper after a description of the present METIS optical design, the stray light rejection design is presented in detail together with METIS off-pointing strategies throughout the mission. Data shown in this paper derive from the optimization of the optical design performed with Zemax ray tracing and from laboratory breadboards of the occultation system and of the polarimeter.