Dr. Chiara Casini Profile

Dr. Chiara Casini

Researcher at CNR-IFN Padova

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 27 August 2024 Poster + Paper

Characterization of the dark signal of the Solar Orbiter/Metis detectors

M. Uslenghi, V. Andretta, L. Teriaca, K. Heerlein, G. Nicolini, M. Pancrazzi, M. Romoli, S. Farina, L. Abbo, A. Burtovoi, C. Casini, Y. De Leo, F. Frassati, G. Jerse, F. Landini, G. Russano, C. Sasso, R. Susino

Proceedings Volume 13103, 1310324 (2024) https://doi.org/10.1117/12.3028609

KEYWORDS: Sensors, Dark current, CMOS sensors, Ultraviolet detectors, Ultraviolet radiation, Coronagraphy, Visible radiation, Image sensors, Signal detection, Sun

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Proceedings Article | 26 August 2024 Presentation + Paper

Design of a circular slit spectrometer

Federico Landini, Fabio Frassetto, Valeria Caracci, Lorenzo Cocola, Lucia Abbo, Vincenzo Andretta, Chiara Casini, Alberto Riva, Silvano Fineschi, Maurizio Pancrazzi, Marco Romoli, Paola Zuppella

Proceedings Volume 13100, 131001M (2024) https://doi.org/10.1117/12.3019946

KEYWORDS: Solar processes, Coronagraphy, Spectroscopy, Optical gratings, Prototyping, Digital micromirror devices, Design, Ultraviolet radiation, Equipment, Zemax

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Despite images of the solar corona in selected bands of the electromagnetic spectrum have been regularly acquired for years, several key questions on its physics and chemistry are unanswered. In order to properly undertake a comprehensive physical study of the solar corona, it is mandatory to investigate its emission lines. Several spectrometer have been investigating the solar corona over the solar disk. The only UV coronagraph/spectrometer flown so far, that has continuously observed the extended solar corona out of the solar disk (from 1.5 R_⊙ to 5 R_⊙), is UVCS (UltraViolet Coronagraph Spectrometer), operative from 1995 to 2009 aboard the SOHO (Solar and Heliospheric Observatory) mission. It was characterized by a 40 arcmin linear slit tangent to the solar limb, moved at different heliocentric heights by means of a tiltable mirror. Different polar angles were explored by rolling the whole instrument. Despite the milestone results it successfully provided, UVCS was not suited to follow the solar corona dynamics: coronal phenomena may evolve on times that range from minutes to hours, while a complete coronal spectrocopic map at full resolution took about 1 day for UVCS to be acquired. A circular slit with variable radius coupled with a grating having circular concentric grooves would reduce by at least 1 order of magnitude the time range needed for mapping the whole solar corona spectrum and would therefore be ideal for performing spectroscopical studies of the UV/EUV dynamics of the solar corona. CISS (CIrcular Slit Spectrometer), funded by the Italian National Institute for Astrophysics (INAF), is a project dedicated to the development of a prototype of a spectrometer with two innovative key features: a circular slit with variable radius and a grating with concentric circular grooves . A certain slit radius identifies a fixed heliocentric height: a radial spectrum of the whole corona at that height is then imaged onto the detector. By changing the slit radius, different heliocentric heights can be explored.
This work presents the prototype design and the status of the project.

Proceedings Article | 23 August 2024 Poster + Paper

In-flight star calibration and simulation methodology for the Metis coronagraph on board solar orbiter

Chiara Casini, Paolo Chioetto, Antonela Comisso, Alain Jody Corso, Silvano Fineschi, Fabio Frassetto, Federico Landini, Marco Romoli, Paola Zuppella, Vania Da Deppo

Proceedings Volume 13092, 130927C (2024) https://doi.org/10.1117/12.3019854

KEYWORDS: Stars, Vignetting, Coronagraphy, Calibration, Device simulation, Sensors, Ultraviolet radiation, Matrices, Reflection

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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

Theoretical, on-ground, and in-flight study of the Metis coronagraph vignetting

C. Casini, P. Chioetto, Y. De leo, V. Da deppo, P. Zuppella, F. Frassetto, M. Romoli, F. Landini, M. Pancrazzi, V. Andretta, A. Bemporad, A. Corso, M. Fabi, S. Fineschi, F. Frassati, C. Grimani, G. Jerse, A. Liberatore, E. Magli, G. Naletto, G. Nicolini, M.G. Pelizzo, P. Romano, C. Sasso, U. Schuehle, D. Spadaro, M. Stangalini, T. Straus, R. Susino, L. Teriaca, M. Uslenghi, M. Casti, P. Heinzel, A. Volpicelli

Proceedings Volume 12777, 1277705 (2023) https://doi.org/10.1117/12.2688589

KEYWORDS: Vignetting, Coronagraphy, Stars, Calibration, Astronomical imaging, Zemax, Ultraviolet radiation, Sun, Solar processes, Mirrors

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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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Proceedings Article | 27 August 2022 Poster + Paper

In-flight Metis radiometric performance verification using the light retro-reflected from its door

C. Casini, V. Da Deppo, P. Zuppella, P. Chioetto, F. Frassetto, M. Romoli, F. Landini, M. Pancrazzi, V. Andretta, Y. De Leo, A. Bemporad, A. Corso, M. Fabi, S. Fineschi, F. Frassati, C. Grimani, G. Jerse, K. Heerlein, A. Liberatore, E. Magli, G. Naletto, G. Nicolini, M. Pelizzo, P. Romano, C. Sasso, U. Schuehle, D. Spadaro, M. Stangalini, T. Straus, R. Susino, L. Teriaca, M. Uslenghi, M. Casti, P. Heinzel, A. Volpicelli

Proceedings Volume 12180, 121803E (2022) https://doi.org/10.1117/12.2631515

KEYWORDS: Sun, Coronagraphy, Ultraviolet radiation, Visible radiation, Space operations, Calibration, Optical components

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Proceedings Article | 11 June 2021 Open Access

In-flight optical performance assessment for the Metis solar coronagraph

Vania Da Deppo, Paolo Chioetto, Vincenzo Andretta, Chiara Casini, Fabio Frassetto, Alessandra Slemer, Paola Zuppella, Marco Romoli, Silvano Fineschi, Petr Heinzel, Giampiero Naletto, Gianalfredo Nicolini, Daniele Spadaro, Marco Stangalini, Luca Teriaca, Alessandro Bemporad, Marta Casti, Michele Fabi, Catia Grimani, Klaus Heerlein, Giovanna Jerse, Federico Landini, Alessandro Liberatore, Enrico Magli, Radek Melich, Maurizio Pancrazzi, Maria-G. Pelizzo, Paolo Romano, Clementina Sasso, Thomas Straus, Roberto Susino, Michela Uslenghi, Cosimo Antonio Volpicelli

Proceedings Volume 11852, 1185210 (2021) https://doi.org/10.1117/12.2599220

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Proceedings Article | 11 June 2021 Open Access

On-ground flat-field calibration of the Metis coronagraph onboard the Solar Orbiter ESA mission

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. Pelizzo, P. Romano, C. Sasso, D. Spadaro, M. Stangalini, T. Straus, R. Susino, L. Teriaca, M. Uslenghi, M. Casti, P. Heinzel, A. Volpicelli

Proceedings Volume 11852, 118525B (2021) https://doi.org/10.1117/12.2599945

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Proceedings Article | 13 December 2020 Presentation + Paper

The MDOR/PDOR on-line module for MISO, the planning software of Solar Orbiter instruments

Cosimo Volpicelli, Federico Landini, Maurizio Pancrazzi, Thomas Straus, Roberto Susino, Gianalfredo Nicolini, Clementina Sasso, Michele Fabi, Yara De Leo, Chiara Casini, Giampiero Naletto, Piergiorgio Nicolosi, Daniele Spadaro, Vincenzo Andretta, Ester Antonucci, Silvano Fineschi, Vania Da Deppo, Paola Zuppella, Fabio Frassetto, Alessandra Slemer, Claude Mercier, Dimitri Kouliche, Stephane Caminade, David Picard, Eric Buchlin, Frédéric Auchère, Marco Romoli

Proceedings Volume 11452, 114520S (2020) https://doi.org/10.1117/12.2562514

KEYWORDS: Logic, Sun, Imaging systems, Remote sensing, Databases, Ultraviolet radiation, Visible radiation, Coronagraphy

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Proceedings Article | 12 July 2019 Open Access

Alignment procedure for the Gregorian telescope of the Metis coronagraph for the Solar Orbiter ESA mission

Vania Da Deppo, Sergio Mottini, Giampiero Naletto, Fabio Frassetto, Paola Zuppella, Mewael Sertsu, Marco Romoli, Silvano Fineschi, Ester Antonucci, Gianalfredo Nicolini, Piergiorgio Nicolosi, Daniele Spadaro, Vincenzo Andretta, Marco Castronuovo, Marta Casti, Gerardo Capobianco, Giuseppe Massone, Roberto Susino, Federico Landini, Maurizio Pancrazzi, Chiara Casini, Luca Teriaca, Michela Uslenghi

Proceedings Volume 11180, 1118076 (2019) https://doi.org/10.1117/12.2536177

KEYWORDS: Telescopes, Ultraviolet radiation, Sensors, Mirrors, Coronagraphy, Optical alignment, Ultraviolet telescopes, Polarimetry, Information operations, Alignment procedures

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Proceedings Article | 12 July 2019 Open Access

Stray light calibration for the Solar Orbiter/Metis solar coronagraph

F. Landini, M. Romoli, S. Fineschi, C. Casini, C. Baccani, E. Antonucci, G. Nicolini, G. Naletto, P. Nicolosi, D. Spadaro, V. Andretta, M. Castronuovo, M. Casti, G. Capobianco, G. Massone, R. Susino, V. Da Deppo, F. Frassetto, M. Pancrazzi, L. Teriaca, U. Schuehle, K. Heerlein, M. Uslenghi

Proceedings Volume 11180, 111802I (2019) https://doi.org/10.1117/12.2536009

KEYWORDS: Stray light, Calibration, Coronagraphy, Information operations, Light emitting diodes, Sun, Vignetting, Mirrors, Ultraviolet radiation, Solar processes

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