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Degradation assessment of LYRA after 5 years on orbit - Technology Demonstration -
BenMoussa, A.; Giordanengo, B.; Gissot, S.; Dammasch, I. E.; Dominique, M.; Hochedez, J.-F.; Soltani, A.; Bourzgui, N.; Saito, T.; Schühle, U.; Gottwald, A.; Kroth, U.; Jones, A. R.
AA(Solar Terrestrial Center of Excellence), AB(Solar Terrestrial Center of Excellence), AC(Solar Terrestrial Center of Excellence), AD(Solar Terrestrial Center of Excellence), AE(Solar Terrestrial Center of Excellence), AF(Solar Terrestrial Center of Excellence; , LATMOS-CNRS UMR 8190, UVSQ, UPMC, IPSL), AG(Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN)), AH(Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN)), AI(Department of Environment & Energy, Tohoku Institute of Technology), AJ(Max Planck Institute for Solar System Research), AK(Physikalisch-Technische Bundesanstalt (PTB)), AL(Physikalisch-Technische Bundesanstalt (PTB)), AM(Laboratory for Atmospheric and Space Physics, University of Colorado)
Experimental Astronomy, Volume 39, Issue 1, pp.29-43 (ExA Homepage)
Publication Date:
UV solar radiometer, Onboard calibration, Degradation, Diamond detector
Abstract Copyright:
(c) 2015: The Author(s)
Bibliographic Code:


We present a long-term assessment of the radiometric calibration and degradation of the Large Yield Radiometer (LYRA), which has been on orbit since 2009. LYRA is an ultraviolet (UV) solar radiometer and is the first space experiment using aboard a pioneering diamond detector technology. We show that LYRA has degraded after the commissioning phase but is still exploitable scientifically after almost 5 years on orbit thanks to its redundancy design and calibration strategy correcting for instrument degradation. We focus on the inflight detector's calibration and show that diamond photodetectors have not degraded while silicon reference photodiodes that are even less exposed to the Sun show an increase of their dark current and a decrease of their photoresponse.
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