Abstract
In the framework of the IRIS programme, full-disk solar Doppler-shift measurements are made with an optical resonance sodium cell spectrophotometer, a new pattern of the instrument successfully used at the geographic South Pole 10 years ago. After many successive improvements, the IRIS version has now become a precise and reliable device, being limited only by the solar and/or by the atmospheric noise in all the frequency ranges of interest for the p-mode and the g-mode investigation. This instrument is described here in some detail, with the technical specification for each individual component being defined by comparison to the photon and the solar noise.
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Grec, G., Fossat, E., Gelly, B. et al. The IRIS sodium cell instrument. Sol Phys 133, 13–30 (1991). https://doi.org/10.1007/BF00149819
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DOI: https://doi.org/10.1007/BF00149819