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Table A.1

Standard artefacts removed from LYRA observations before applying LYRAFF.

Artefact Description

ASIC reload Reload of the application apecific integrated circuit.
Calibration Calibration campaign.
Glitch Undefined glitch.
LAR Large angle rotation. 90° rotation of satellite lasting a
few minutes. Cause spikes and dips in the signal.
Moon in LYRA Moon in LYRA field of view which can cause
non-solar variations in signal.
Offpoint PROBA2 offpointed from disk centre potentially altering
signal artificially.
Operational anomaly Unexplained anomaly.
Recovery Time taken for LYRA detectors to get back to full efficiency
after not being exposed to sunlight. Can take many hours.
SAA Transition of PROBA2 through the South Atlantic anomaly
causing increased noise in signal.
UV occultation Solar irradiance attenuated by Earth’s atmosphere.
Defined as when PROBA2’s tangential altitude is 350 km.
Visible occultation Solar irradiance is blocked by the disk of the Earth.

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