Analysis of the uncertainties in the determination of the Stokes parameters employing the proof of concept prototype of the spectropolarimeter for the Galileo Solar Space Telescope (GSST/INPE)

• Grant number: 19/13181-0
• Support Opportunities: Scholarships in Brazil - Master
• Start date: November 01, 2019
• End date: January 31, 2021
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Luis Eduardo Antunes Vieira
• Grantee: Adriany Rodrigues Barbosa
• Host Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovação (Brasil). São José dos Campos , SP, Brazil
• Associated scholarship(s): 19/25255-8 - Analysis of the uncertainties in the determination of the Stokes parameters, BE.EP.MS

Abstract

The study of the solar magnetic field is of great importance, since this is associated with solar phenomena and consequently with the terrestrial space environment and the security of the high technology. A better understanding of the Sun's magnetic field is fundamental to better understand how the sun influences the Earth. Therefore, methods to estimate the solar magnetic field were developed, from the Earth or the space near the Earth. Spectropolarimetry is one of the most applied techniques. INPE's solar physics group is developing a spectropolarimeter through the Galileo Solar Space Telescope (GSST) Project. The proof of concept is composed of a Ritchey-Chrétiende telescope, a polarization modulation package, a Fabry-Pérot Etalon interferometer, sCMOS cameras, narrow band filters and adaptive optics. Knowing that the noise level in the images of the Stokes parameters strongly influences the quality and final performance of the instrument, ensuring a good calibration of the instrument and being aware of its uncertainties is of utmost importance. In this project, the Stokes parameters from the GSST's proof of concept prototype will be estimated as well as the uncertainties of this instrument. To achieve this, the components will be calibrated, the Mueller matrix will be estimated. The methodology will be compared with the one applied to another instrument. The results of this study are greatly important for the next phase of the project and will contribute to the GSST project as a whole. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

VIEIRA, L. E. A.; KOPP, G.; DUDOK DE WIT, T.; DA SILVA, L. A.; CARLESSO, F.; BARBOSA, A. R.; MURALIKRISHNA, A.; SANTOS, R.. Variability of the Sun's Luminosity Places Constraints on the Thermal Equilibrium of the Convection Zone. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, v. 260, n. 2, p. 12-pg., 2022-06-01. (21/13309-6, 19/13181-0)

BARBOSA, ADRIANY RODRIGUES; CARLESSO, FRANCIELE; VIEIRA, LUIS EDUARDO ANTUNES. Development of a proof-of-concept spectropolarimeter in the framework of the GSST mission: Characterization and performance analysis of a sCMOS image sensor. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES, v. 9, p. 14-pg., 2022-10-20. (19/25255-8, 21/13309-6, 19/13181-0)