Počet záznamů: 1
The He I 10 830 angstrom line: Radiative transfer and differential illumination effects
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SYSNO ASEP 0574433 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The He I 10 830 angstrom line: Radiative transfer and differential illumination effects Tvůrce(i) Arevalo, A. V. (ES)
Štěpán, Jiří (ASU-R) RID, ORCID
Aleman, T. P. (ES)
Martínez González, J. M. (ES)Celkový počet autorů 4 Číslo článku A45 Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 675, June (2023)Poč.str. 8 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova atomic processes ; polarization ; radiative transfer Obor OECD Astronomy (including astrophysics,space science) CEP GA19-20632S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora ASU-R - RVO:67985815 UT WOS 001023752300025 EID SCOPUS 85164538562 DOI 10.1051/0004-6361/202346089 Anotace We study the formation of the Stokes profiles of the He I multiplet at 10 830 angstrom when relaxing two of the approximations that are typically considered in the modeling of this multiplet. Specifically, these are the lack of self-consistent radiation transfer and the assumption of equal illumination of the individual multiplet components. This He I multiplet is among the most important for the diagnostics of the outer solar atmosphere from spectropolarimetric observations, especially in prominences, filaments, and spicules. However, the aptness of these approximations is yet to be assessed, especially in situations where the optical thickness is on the order of one (or greater) and the radiation transfer has a significant impact in the local anisotropy as well as the ensuing spectral line polarization. This issue becomes particularly relevant in the ongoing development of new inversion tools that take into account multi-dimensional radiation transfer effects. To relax these approximations, we generalized the multi-term equations for the atomic statistical equilibrium to allow for a differential illumination of the multiplet components and implement them in a one-dimensional (1D) radiative transfer code. We find that even for this simple geometry and relatively small optical thickness, both radiation transfer and differential illumination effects have a significant impact on the emergent polarization profiles. These effects should be taken into account in order to avoid potentially significant errors when inferring the magnetic field vector. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2024 Elektronická adresa https://hdl.handle.net/11104/0345157
Počet záznamů: 1