Dr. Sergey V. Shestov Profile

Dr. Sergey V. Shestov

at Royal Observatory of Belgium

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Publications (5)

Proceedings Article | 13 December 2020 Paper

Scientific processing pipeline for ASPIICS coronagraph

Sergei Shestov, Bram Bourgoignie, Bogdan Nicula, Laurent Dolla, Christophe Jean, Freek Verstringe, Athanassios Katsiyannis, Bernd Inhester, Dalmiro Maia, Bruno Miguel Freitas Ribeiro, Andrei Zhukov

Proceedings Volume 11443, 114432U (2020) https://doi.org/10.1117/12.2560164

KEYWORDS: Coronagraphy, Image compression, Optical filters, Solar processes, Space operations, Atmospheric sciences, Scattering, Optical components, Sensors, Detection and tracking algorithms

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Proceedings Article | 12 July 2019 Open Access

Straylight analysis on ASPIICS, PROBA-3 coronagraph

C. Galy, C. Thizy, Y. Stockman, D. Galano, R. Rougeot, R. Melich, S. Shestov, F. Landini, A. Zukhov, V. Kirschner, P. Horodyska, S. Fineschi

Proceedings Volume 11180, 111802H (2019) https://doi.org/10.1117/12.2536008

KEYWORDS: Sensors, Coronagraphy, Diffraction, Scattering, Solar processes, Signal detection, Lenses, Sun, Reflectivity, Optical filters

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PROBA-3 is a mission devoted to the in-orbit demonstration (IOD) of precise formation flying (F²) techniques and technologies for future ESA missions. The mission includes two spacecraft. One of them will act as an external occulter for scientific observations of the solar corona from the other spacecraft, which will hold the ASPIICS coronagraph instrument, under CSL responsibility.

The ASPIICS instrument on PROBA-3 looks at the solar corona through a refractive telescope, able to select 3 different spectral bands: Fe XIV line @ 530.4nm, He I D3 line @587.7nm, and the white-light spectral band [540;570nm]. The external occulter being located at ~ 150 meters from the instrument entrance, will allow ASPIICS to observe the corona really close to the solar limb, probably closer than any internally or externally occulted coronagraph ever observed.

This paper will present the straylight model and analyses carried out by CSL. A first specificity of the analysis is that the scene on the useful Field of View (FOV) is the solar corona which has a brightness dynamic range as high as 10³ between the close corona, close to 1 solar radius (Rsun), and the “distant” corona around 3RSun. The specifications are very stringent for this type of instrument. A consensus was found and will be presented regarding the expected straylight within the FOV. It will also be shown that to achieve realistic estimations it is required to take into account the exact location of the created straylight as well as the entrance field.

The second specificity that had to be analyzed is that the diffraction from the solar disk by the external occulter enters the instrument un-obstructed until the internal occulter, and with a brightness 100 times higher than the close corona (~1RSun) brightness. The simulation of this diffraction as well as its propagation inside the ASPIICS telescope creating additional straylight, had to be carefully established in order to give realistic results of its impact on the performances while being actually possible to compute.

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Proceedings Article | 6 July 2018 Paper

Straylight analysis for the externally occulted Lyot solar coronagraph ASPIICS

Raphaël Rougeot, Claude Aime, Cristian Baccani, Silvano Fineschi, Rémi Flamary, Damien Galano, Camille Galy, Volker Kirschner, Federico Landini, Marco Romoli, Sergei Shestov, Cédric Thizy, Jorg Versluys, Andrei Zhukov

Proceedings Volume 10698, 106982T (2018) https://doi.org/10.1117/12.2313258

KEYWORDS: Diffraction, Coronagraphy, Sun, Telescopes, Sensors, Stray light analysis, Wave propagation, Wavefronts, Information operations, Space operations

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Proceedings Article | 25 July 2014 Paper

Complex of instrumentation KORTES for the EUV and x-ray imaging and spectroscopy of the solar corona

Sergey Shestov, Artem Ulyanov, Eugene Vishnyakov, Andrei Pertsov, Sergey Kuzin

Proceedings Volume 9144, 91443G (2014) https://doi.org/10.1117/12.2055946

KEYWORDS: Extreme ultraviolet, Solar processes, X-rays, Telescopes, X-ray imaging, Sensors, Space telescopes, Imaging spectroscopy, Coronagraphy, Multilayers

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Proceedings Article | 30 April 2009 Paper

Spectroscopic characterization of novel multilayer mirrors intended for astronomical and laboratory applications

Eugene Ragozin, Konstantin Mednikov, Andrei Pertsov, Alexander Pirozhkov, Anton Reva, Sergei Shestov, Artem Ul'yanov, Eugene Vishnyakov

Proceedings Volume 7360, 73600N (2009) https://doi.org/10.1117/12.820750

KEYWORDS: Mirrors, Reflectivity, Spectroscopy, Imaging spectroscopy, Multilayers, Plasma, Absorption, Sensors, Aluminum, Ions

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