  Theoretical investigations predicted that high spatio-temporal resolution
observations in the Sr I 4607 A line must show a conspicuous scattering
polarization pattern at the solar disk-center, which encodes information on the
unresolved magnetism of the inter-granular photospheric plasma. Here we present
a study of the impact of limited time resolution on the observability of such
forward scattering (disk-center) polarization signals. Our investigation is
based on three-dimensional radiative transfer calculations in a time-dependent
magneto-convection model of the quiet solar photosphere, taking into account
anisotropic radiation pumping and the Hanle effect. This type of radiative
transfer simulation is computationally costly, reason why the time variation
had not been investigated before for this spectral line. We compare our
theoretical results with recent disk-center filter polarimetric observations in
the Sr I 4607 A line, showing that there is good agreement in the polarization
patterns. We also show what we can expect to observe with the Visible
Spectro-Polarimeter at the upcoming Daniel K. Inouye Solar Telescope.
