Solar Orbiter, launched on February 9^th 2020, is an ESA/NASA mission conceived to study the Sun. This work presents the embedded Metis coronagraph and its on-ground calibration in the 580-640 nm wavelength range using a flat field panel. It provides a uniform illumination to evaluate the response of each pixel of the detector; and to characterize the Field of View (FoV) of the coronagraph. Different images with different exposure times were acquired during the on-ground calibration campaign. They were analyzed to verify the linearity response of the instrument and the requirements for the FoV: the maximum area of the sky that Metis can acquire.

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C. Casini, V. Da Deppo, P. Zuppella, P. Chioetto, A. Slemer, F. Frassetto, M. Romoli, F. Landini, M. Pancrazzi, V. Andretta, Y. De Leo, A. Bemporad, M. Fabi, S. Fineschi, F. Frassati, C. Grimani, G. Jerse, K. Heerlein, A. Liberatore, E. Magli, G. Naletto, G. Nicolini, M. G. Pelizzo, P. Romano, C. Sasso, D. Spadaro, M. Stangalini, T. Straus, R. Susino, L. Teriaca, M. Uslenghi, M. Casti, P. Heinzel, and A. Volpicelli, "On-ground flat-field calibration of the Metis coronagraph onboard the Solar Orbiter ESA mission," Proc. SPIE 11852, International Conference on Space Optics — ICSO 2020, 118525B (Presented at International Conference on Space Optics — ICSO 2021: 11 June 2021; Published: 11 June 2021); https://doi.org/10.1117/12.2599945.