The Effects of Three-dimensional Radiative Transfer on the Resonance Polarization of the Ca I 4227 angstrom Line
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00547681" target="_blank" >RIV/67985815:_____/21:00547681 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/1538-4357/abd94a" target="_blank" >https://doi.org/10.3847/1538-4357/abd94a</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/abd94a" target="_blank" >10.3847/1538-4357/abd94a</a>
Alternative languages
Result language
angličtina
Original language name
The Effects of Three-dimensional Radiative Transfer on the Resonance Polarization of the Ca I 4227 angstrom Line
Original language description
The sizable linear polarization signals produced by the scattering of anisotropic radiation in the core of the Ca I 4227 Å line constitute an important observable for probing the inhomogeneous and dynamic plasma of the lower solar chromosphere. Here we show the results of a three-dimensional (3D) radiative transfer complete frequency redistribution investigation of the line's scattering polarization in a magnetohydrodynamical 3D model of the solar atmosphere. We take into account not only the Hanle effect produced by the model's magnetic field but also the symmetry breaking caused by the horizontal inhomogeneities and macroscopic velocity gradients. The spatial gradients of the horizontal components of the macroscopic velocities produce very significant forward scattering polarization signals without the need of magnetic fields, while the Hanle effect tends to depolarize them at the locations where the model's magnetic field is stronger than about 5 G. The standard 1.5D approximation is found to be unsuitable for understanding the line's scattering polarization, but we introduce a novel improvement to this approximation that produces results in qualitative agreement with the full 3D results. The instrumental degradation of the calculated polarization signals is also investigated, showing what we can expect to observe with the Visible Spectro-Polarimeter at the upcoming Daniel K. Inouye Solar Telescope.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA19-20632S" target="_blank" >GA19-20632S: Forward modeling and inversion of polarized solar spectra in multi-dimensional geometries</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
0004-637X
e-ISSN
1538-4357
Volume of the periodical
909
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
15
Pages from-to
183
UT code for WoS article
000629568800001
EID of the result in the Scopus database
2-s2.0-85103300813