Unspecified Giuliana Russano Profile

Giuliana Russano

at INAF - Osservatorio Astronomico di Capodimonte

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Publications (2)

Proceedings Article | 12 July 2023 Open Access

Out-of-focus point sources image simulation for the Metis solar coronagraph onboard the Solar Orbiter mission

Vania Da Deppo, Chiara Casini, Paolo Chioetto, Fabio Frassetto, Simone Nordera, Paola Zuppella, Alain Corso, Federico Landini, Maurizio Pancrazzi, Roberto Susino, Clementina Sasso, Michela Uslenghi, Marco Romoli, Vincenzo Andretta, Silvano Fineschi, Giampiero Naletto, Gianalfredo Nicolini, Daniele Spadaro, Marco Stangalini, Luca Teriaca, Lucia Abbo, Catia Grimani, Aleksandr Burtovoi, Yara De Leo, Michele Fabi, Federica Frassati, Giovanna Jerse, Giuliana Russano

Proceedings Volume 12777, 1277764 (2023) https://doi.org/10.1117/12.2691114

KEYWORDS: Equipment, Coronagraphy, Particles, Vignetting, Telescopes, Shadows, Mirrors, Ultraviolet radiation, Astronomical imaging, Sun

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Metis is a multi-wavelength coronagraph onboard the European Space Agency (ESA) Solar Orbiter mission. Thanks to the selected Solar Orbiter mission profile, for the first time the poles of the Sun and the circumsolar region will be seen and studied from a privileged point of view near the Sun (minimum distance 0.28 AU). Metis features an innovative instrument design conceived for simultaneously imaging the visible (580-640 nm) and ultraviolet (Lyman α at 121.6 nm) emission of the solar corona. METIS is an externally occulted coronagraph which adopts an “inverted occulted” configuration. The inverted external occulter (IEO) is a circular aperture after which a spherical mirror M0 rejects back the solar disk light, which exits the instrument through the IEO aperture itself. The passing coronal light is then collected by the METIS telescope. Common to both channels, the Gregorian on-axis telescope is centrally occulted and both the primary and the secondary mirrors have annular shape. The optical and radiometric performance of the telescope is strongly dependent on the huge degree of vignetting presented by the optical design. The internal fields are highly vignetted by M0 and further vignetted by the internal elements, such as the internal occulter and the Lyot stop, furthermore the presence of some spiders, needed to mount the internal elements, are vignetting even more, in some parts of the FoV, the light beams. During the instrument commissioning, in the visible light channel some out-of-focus sources have been imaged while moving in the Metis FoV. At a first glance, the out-of-focus images exhibit a very strange pattern. The pattern can be explained by taking into account the peculiar design of the Metis coronagraph instrument; in fact, the not fully illuminated pupil gives rise to “half moon” shape out-of-focus images with the spiders casting their shadow in different positions. In this work, the ray-tracing simulation results for the out-of-focus images are compared with some of the images taken in flight; some considerations relating the shape and dimension of the acquired images with the distance from Metis of the sources are also given.

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Proceedings Article | 12 July 2023 Open Access

In flight stray light estimate for the Solar Orbiter/Metis coronagraph

Federico Landini, Marco Romoli, Gianalfredo Nicolini, Fabio Frassetto, Roberto Susino, Lucia Abbo, Vincenzo Andretta, Aleksandr Burtovoi, Chiara Casini, Paolo Chioetto, Alain Corso, Vania Da Deppo, Yara De Leo, Michele Fabi, Silvano Fineschi, Federica Frassati, Catia Grimani, Petr Heinzel, Giovanna Jerse, Alessandro Liberatore, Giampiero Naletto, Maurizio Pancrazzi, Giuliana Russano, Clementina Sasso, Daniele Spadaro, Marco Stangalini, Daniele Telloni, Luca Teriaca, Michela Uslenghi, Cosimo Volpicelli, Paola Zuppella

Proceedings Volume 12777, 1277704 (2023) https://doi.org/10.1117/12.2688578

KEYWORDS: Information operations, Stray light, Coronagraphy, Astronomical imaging, Solar processes, Visible radiation, Equipment, Sun, Space operations, Ultraviolet radiation

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