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We examine the capabilities of a fast and simple method to inferline-of-sight (LOS) velocities from observations of the photospheric Si I 10827A line. This spectral line is routinely observed together with thechromospheric He I 10830 A triplet as it helps to constrain the atmosphericparameters. We study the accuracy of bisector analysis and a line core fit ofSi I 10827 A. We employ synthetic profiles starting from the Bifrost enhancednetwork simulation. The profiles are computed solving the radiative transferequation, including non-local thermodynamic equilibrium effects on thedetermination of the atomic level populations of Si I. We found a goodcorrelation between the inferred velocities from bisectors taken at differentline profile intensities and the original simulation velocity at given opticaldepths. This good correlation means that we can associate bisectors taken atdifferent line-profile percentages with atmospheric layers that linearlyincrease as we scan lower spectral line intensities. We also determined that afit to the line-core intensity is robust and reliable, providing informationabout atmospheric layers that are above those accessible through bisectors.Therefore, by combining both methods on the Si I 10827 A line, we canseamlessly trace the quiet-Sun LOS velocity stratification from the deepphotosphere to higher layers until around $\log \tau = -3.5$ in a fast andstraightforward way. This method is ideal for generating quick-look referenceimages for future missions like the Daniel K. Inoue Solar Telescope and theEuropean Solar Telescope, for example.

Capabilities of bisector analysis of the Si I 10827 A line for estimating line-of-sight velocities in the quiet Sun