2025 LYRA Level 4 (Calibrated)

• "Calibrated" currently means that the dark currents were subtracted, the trend due to instrumental degradation was removed, solar values were normalized to 1AU, and the LYRA count rates were converted to physical units with the aid of a comparison to other instruments on LYRA's First Light Day. Daily and orbital variations of the channels due to on-board temperature changes were corrected using the HK temperatures contained in the Level-1-metadata FITS file. The curves still include four regular disturbances per orbit due to spacecraft rotations, and possible disturbances due to commanding. Gaps may be caused by missing downlinks or calibration campaigns.
• From October to February, PROBA2 experiences "eclipse season". For several minutes during each orbit, the solar disk is occulted by the Earth, and the observed irradiances sometimes decrease down to dark-current levels - thus the strange comb-like shape of the curves in the regular LYRA pages; on this page, the gaps and the occultation patterns are corrected with an approach described here.

February 2025

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January 2025

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