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Table 2.

Observed granulation contrasts with SST/CRISP.

Wavelength (nm) 525 558 630 853.5

No corr. 10.9 10.5 10.7 10.6 9.2 9.2 6.3 5.6
MTF corr. 11.8 11.5 11.8 11.6 10.2 10.2 7.2 6.2
MFBD corr. 13.9 13.7 13.4 13.1 11.7 11.5 8.2 7.2
Num. simulations 20.7 19.6 18.4 18.0 15.1 14.7 10.3 9.0

r0 (m) 0.164 0.239 0.238 0.270

Notes. Summary of observed RMS granulation contrast, given in percent of the mean intensity, for the SST/CRISP wideband (WB) and narrowband (NB) wavelengths indicated. The contrasts given correspond to the best seeing conditions for each data set (wavelength) separately. That seeing quality is defined by the value of Fried’s parameter r0, also given in the Table, which is scaled from the measured value at 500 nm to that of the actual wavelength. In this table and in the following, r0 refers to measurements made over a 4″ × 4″ FOV. “No corr.” corresponds to image data that have not been post-processed beyond that of dark and gain correction, “MTF corr.” to images also compensated for tip-tilt and the diffraction limited PSF, and “MFBD corr.” to images that have been processed with the multi-frame blind deconvolution technique to (partially) also compensate for residual seeing and telescope aberrations using 100 KL modes.

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