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The Birmingham Solar Oscillations Network (BiSON) has provided high-qualityhigh-cadence observations from as far back in time as 1978. These data must becalibrated from the raw observations into radial velocity and the quality ofthe calibration has a large impact on the signal-to-noise ratio of the finaltime series. The aim of this work is to maximise the potential science that canbe performed with the BiSON data set by optimising the calibration procedure.To achieve better levels of signal-to-noise ratio we perform two key steps inthe calibration process: we attempt a correction for terrestrial atmosphericdifferential extinction; and the resulting improvement in the calibrationallows us to perform weighted averaging of contemporaneous data from differentBiSON stations. The improvements listed produce significant improvement in thesignal-to-noise ratio of the BiSON frequency-power spectrum across allfrequency ranges. The reduction of noise in the power spectrum will allowfuture work to provide greater constraint on changes in the oscillationspectrum with solar activity. In addition, the analysis of the low-frequencyregion suggests we have achieved a noise level that may allow us to improveestimates of the upper limit of g-mode amplitudes.

BiSON data preparation: A correction for differential extinction and the weighted averaging of contemporaneous data