1. Institutes Royal Observatory of Belgium (Brussels, BE) Principal Investigator, overall design, onboard software specification, science operations PMOD/WRC (Davos, CH) Lead Co-Investigator, overall design and manufacture Centre Spatial de Liège (BE) Lead institute, project management, filters IMOMEC (Hasselt, BE) Diamond detectors Max-Planck-Institut für Sonnensystemforschung (Lindau DE) Calibration science Co-Is: BISA (Brussels, BE), LPC2E (Orléans, FR)… Measurement: Solar irradiance in four UV to XUV channels: “Herzberg”, “Lyman-alpha”, “Aluminum”, “Zirconium” Science: Solar flares, space weather services, aeronomy (atmospheric occultations & input to climate models) Technological First: diamond UV detectors for astrophysics And also: high cadence (> 20Hz), 3 redundant units, 24 LEDs, synchrotron calibration LYRA the Large Yield RAdiometer 1/3 Introduction Exploded view of one of the 3 identical LYRA units A diamond detectorCalibrating LYRA at the Berlin synchrotron LYRA integrated on PROBA2 PRODEX

2. 2 Nov. 2009: PROBA2 launch 16 Nov. 2009: 1 st LYRA “Switch On” Dec. 2009: dark and LED data 5 & 6 Jan. 2010: unlock all 3 covers 6 Jan. 2010: First Light for all 3 units All 12 channels work. 11 Jan. 2010: LYRA 1 st flare 15 Jan. 2010: lunar eclipse LYRA the Large Yield Radiometer 2/3 First Light & lunar eclipse 14 Jan 2010 18 Jan 2010 LYRA with Unit 2 opened The ‘South Atlantic Anomaly’ perturbing only LYRA silicon detectors, not diamond 4 days of LYRA data in its EUV channels Blow-up on the data (all 4 channels) during the lunar eclipse of 15 Jan. 2010. The Sun is less homogeneous in XUV than in UV! Lunar eclipse of Jan. 15 th solar flares Regular terrestrial occultations (eclipse season in Jan. 2010)

3. LYRA the Large Yield Radiometer 3/3 First results M1.8 flare of 20/01/2010 10:48 by LYRA and GOES Onset of the flarePeak of the flare EUV fluxes (LYRA) grow faster than X-Rays (GOES) EUV fluxes (LYRA) peak after X-Rays (GOES) ~160 km ~120 km ~410 km ~220 km ~360 km Earth Successive sunsets and sunrises for all four channels (17 Jan. 2010) Scientists will make useful and exciting science with LYRA data