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

Abstract : 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 PTB's 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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A. Benmoussa, I. E. Dammasch, Jean-François Hochedez, U. Schuhle, S. Koller, et al.. Pre-flight calibration of LYRA, the solar VUV radiometer on board PROBA2. Astronomy and Astrophysics - A&A, EDP Sciences, 2009, 508 (2), pp.1085-1094. ⟨10.1051/0004-6361/200913089⟩. ⟨insu-02986672⟩

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