Discussion Topic: Differential Atmospheric Refraction in GMOS Data

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This topic contains 0 replies, has 1 voice, and was last updated by  Catherine Huitson 1 year, 1 month ago.

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    Catherine Huitson
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    Dear all,

    Since neither GMOS is equipped with an ADC, how does differential atmospheric refraction affect you, and how do you correct for it?

    For example, some of my work uses low-resolution timeseries spectra, and we see the wavelength solution changing during the observation. One approach that I have used for our data is to compute a theoretical model for the expected offsets as a function of wavelength and airmass and use these to interpolate each individual spectrum onto a constant wavelength grid. We lack sufficient resolution to use the spectral lines themselves to measure wavelength offsets for most wavelengths, which is why we rely on a model.

    Does differential atmospheric refraction affect you in a different way? What correction procedures do you use and why do you prefer them?

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