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Pre-flight calibration of LYRA, the solar VUV radiometer on board PROBA2

Pre-flight calibration of LYRA, the solar VUV radiometer on board PROBA2

Publication date: 04 November 2009

Authors: BenMoussa, A., et al.

Journal: Astronomy & Astrophysics
Volume: 508
Issue: 2
Page: 1085-1094
Year: 2009

Copyright: ESO 2009

Aims. LYRA, the Large Yield Radiometer, is a vacuum ultraviolet (VUV) solar radiometer, planned to be launched in November 2009 on the European Space Agency PROBA2, the Project for On-Board Autonomy spacecraft.

Methods. The instrument was radiometrically calibrated in the radiometry laboratory of the Physikalisch-Technische Bundesanstalt (PTB) at the Berlin Electron Storage ring for SYnchroton radiation (BESSY II). The calibration was done using monochromatized synchrotron radiation at PTBs VUV and soft X-ray radiometry beamlines using reference detectors calibrated with the help of an electrical substitution radiometer as the primary detector standard.

Results. A total relative uncertainty of the radiometric calibration of the LYRA instrument between 1% and 11% was achieved. LYRA will provide irradiance data of the Sun in four UV passbands and with high temporal resolution down to 10 ms. The present state of the LYRA pre-flight calibration is presented as well as the expected instrument performance.

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