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The GOLF resonant scattering spectrophotometer aboard SoHO has now provided15 years of continuous high precision Sun-as-a-star radial-velocitymeasurements. This length of time series provides very high resolution in thefrequency domain and is combined with very good long-term instrumentalstability. These are the requirements for measuring the low-l low-frequencyglobal oscillations of the Sun that will unlock the secrets of the solar core.However, before the scientifically interesting gravity and mixed modes ofoscillation fully reveal themselves, a correction and calibration of the wholedata set is required. Here we present work towards producing a 15 year GOLFdata set corrected for instrumental ageing and thermal variation.

Calibrating 15 years of GOLF data