The impact of limited time resolution on the forward-scattering polarization in the solar Sr I 4607 Å line
arXiv:2101.08485 · doi:10.3847/1538-4357/abdd25
Abstract
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.
arXiv comment11 pages, 10 figures, accepted for publication in the Astrophysical Journal
References in corpus (14)
- A Substantial Amount of Hidden Magnetic Energy in the Quiet Sun
- Numerical simulations of quiet Sun magnetism: On the contribution from a small-scale dynamo
- Extension of the MURaM radiative MHD code for coronal simulations
- PORTA: A three-dimensional multilevel radiative transfer code for modeling the intensity and polarization of spectral lines with massively parallel computers
- A novel investigation of the small-scale magnetic activity of the quiet Sun via the Hanle effect in the Sr I 4607 Å line
- Three-dimensional Radiative Transfer Modeling of the Polarization of the Sun's Continuous Spectrum
- The magnetic sensitivity of the resonance and subordinate lines of Mg II in the solar chromosphere
- High-resolution, high-sensitivity, ground-based solar spectropolarimetry with a new fast imaging polarimeter
- The Hanle and Zeeman polarization signals of the solar Ca II 8542 Å line
- Scattering Polarization and Hanle Effect in Stellar Atmospheres with Horizontal Inhomogeneities
- The Scattering Polarization of the Sr I 4607 ÅLine at the Diffraction Limit Resolution of a 1-m Telescope
- Spatial variations of the Sr i 4607 Å scattering polarization peak
- Solar disk center shows scattering polarization in the Sr I 4607 Å line
- Observations on spatial variations of the Sr~{\sc i} 4607~Å~scattering polarization signals at different limb distances with ZIMPOL