Paper 14145-43
Paper 14145-43
ACS-NIR spectrometer (TGO) calibration matrices for flat field, stray light, and spectral contamination
7 July 2026 • 13:40 - 14:00 CEST | Room B4-M3
Abstract
The ACS-NIR spectrometer on TGO (Trace Gas Orbiter) is still being used to probe the Martian atmosphere in the infrared. The solar spectrum can be obtained when the ACS-NIR line-of-sight is above the Martian atmosphere, that is when it is pointed directly at the Sun. This solar spectrum serves as a reference for spectra acquired through the atmosphere and for spectral calibration. The processing chain of the diffraction orders of ACS-NIR must be efficient to construct a high-quality solar spectrum across the entire spectral domain of the instrument. Therefore, calibration data have been recorded for this purpose. This paper first presents ACS-NIR then the calibration data. It then explains how these data are used to develop new techniques for estimating the flat-field and stray light matrices for ACS-NIR. Finally, the paper describes how the spectral contamination matrix is obtained and then used to reconstruct the spectral bands of diffraction orders from those of their neighbors.
Presenter
Lab. Atmosphères, Milieux, Observations Spatiales (France)
Dr. Abdanour Irbah received his doctorate from the University of Nice Sophia-Antipolis (France) in 1986. He began his career at CRAAG (Research Center in Astronomy, Astrophysics and Geophysics – Algeria) in 1987, where he served as Research Director until 2001. There, he headed the Department of Astronomy and Astrophysics. In 2001, he joined the LATMOS laboratory (Aeronomy Service) of the CNRS as a research engineer, contributing to the development of space instruments and related studies. Dr. Abdanour Irbah's research focuses on atmospheric optics, the Earth's atmosphere, solar physics, and instrumental physics. He also specializes in data and image processing. He participated in the PICARD space mission (2010-2014), its ground segment, and several other space missions (TGO, EarthCare ..). He is the author of numerous scientific publications and communications (https://www.researchgate.net/profile/Abdanour-Irbah/).