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- W2471878960 abstract "A comparison of the FWHM of standard stars observed with VISIR, the mid-IR imager and spectrometer at ESO's VLT, with expectations for the achieved mid-IR Image Quality based on the optical seeing and the wavelength-dependence of atmospheric turbulence, shows that for N-band data (7{12μm), VISIR realizes an image quality about 0.1 worse than expected based on the optical seeing. This difference is large compared to the median N-band image quality of 0.3-0.4 achieved by VISIR. We also note that other mid-IR groundbased imagers show similar image quality in the N-band. We attribute this difference to an under-estimate of the effect of the atmosphere in the mid-IR in the parameters adopted so far for the extrapolation of optical to mid-IR seeing. Adopting an average outer length-scale of the atmospheric turbulence above Paranal <i>L<sub>0</sub></i> = 46 m (instead of the previously used <i>L<sub>0</sub></i> = 23 m) improves the agreement between predicted and achieved image quality in the mid-IR while only having a modest effect on the predicted image quality at shorter wavelengths (although a significant amount of scatter remains, suggesting that l0 may not be constant in time). We therefore advocate adopting <i>L<sub>0</sub></i> = 46 m for the average outer length scale of atmospheric turbulence above Cerro Paranal for real-time scheduling of observations on VLT UT3 (Melipal)." @default.
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- W2471878960 date "2016-07-18" @default.
- W2471878960 modified "2023-09-25" @default.
- W2471878960 title "Investigating the effect of atmospheric turbulence on mid-IR data quality with VISIR" @default.
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- W2471878960 doi "https://doi.org/10.1117/12.2233701" @default.
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