Počet záznamů: 1  

Novel framework for the three-dimensional NLTE inverse problem

  1. 1.
    SYSNO ASEP0556497
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevNovel framework for the three-dimensional NLTE inverse problem
    Tvůrce(i) Štěpán, Jiří (ASU-R) RID, ORCID
    del Pino Alemán, T. (ES)
    Trujillo Bueno, J. (ES)
    Celkový počet autorů3
    Číslo článkuA137
    Zdroj.dok.Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
    Roč. 659, March (2022)
    Poč.str.18 s.
    Forma vydáníOnline - E
    Jazyk dok.eng - angličtina
    Země vyd.FR - Francie
    Klíč. slovamultidimensional radiative-transfer ; multilevel atoms ; polarization
    Vědní obor RIVBN - Astronomie a nebeská mechanika, astrofyzika
    Obor OECDAstronomy (including astrophysics,space science)
    CEPGA19-20632S GA ČR - Grantová agentura ČR
    GA19-16890S GA ČR - Grantová agentura ČR
    Způsob publikováníOpen access s časovým embargem (01.04.2023)
    Institucionální podporaASU-R - RVO:67985815
    UT WOS000770104200001
    EID SCOPUS85127135134
    DOI10.1051/0004-6361/202142079
    AnotaceThe inversion of spectropolarimetric observations of the solar upper atmosphere is one of the most challenging goals in solar physics. If we account for all relevant ingredients of the spectral line formation process, such as the three-dimensional (3D) radiative transfer out of local thermodynamic equilibrium (NLTE), the task becomes extremely computationally expensive. Instead of generalizing 1D methods to 3D, we have developed a new approach to the inverse problem. In our meshfree method, we do not consider the requirement of 3D NLTE consistency as an obstacle, but as a natural regularization with respect to the traditional pixel-by-pixel methods. This leads to more robust and less ambiguous solutions. We solve the 3D NLTE inverse problem as an unconstrained global minimization problem that avoids repetitive evaluations of the ? operator. Apart from the 3D NLTE consistency, the method allows us to easily include additional conditions of physical consistency such as the zero divergence of the magnetic field. Stochastic ingredients make the method less prone to ending up within the local minima of the loss function. Our method is capable of solving the inverse problem faster by several orders of magnitude than by using grid-based methods. The method can provide accurate and physically consistent results if sufficient computing time is available, along with approximate solutions in the case of very complex plasma structures or limited computing time.
    PracovištěAstronomický ústav
    KontaktRadka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
    Rok sběru2023
    Elektronická adresahttps://doi.org/10.1051/0004-6361/202142079
Počet záznamů: 1  

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