PORTA: POlarized Radiative TrAnsfer

0559390 - ASÚ 2023 RIV CZ eng L4 - Software
Štěpán, Jiří - Trujillo Bueno, J.
PORTA: POlarized Radiative TrAnsfer.
Internal code: PORTA ; 2020
Technical parameters: Program v jazyce C pro výpočty 3D NLTE přenosu záření v plasmatu hvězných atmosfér se započtením polarizace záření vhodný pro masivně paralelní výpočty. Součástí je i grafické uživatelské rozhraní (Python) pro vizualizaci výsledků.
Economic parameters: vyvinutý software pro základní výzkum
R&D Projects: GA ČR GPP209/12/P741
Institutional support: RVO:67985815
Keywords : line formation * magnetic fields * polarization
OECD category: Astronomy (including astrophysics,space science)
https://gitlab.com/polmag/PORTA

PORTA solves three-dimensional non-equilibrium radiative transfer problems with massively parallel computers. The code can be used
for modeling the spectral line polarization produced by the scattering of anisotropic radiation and the Hanle and Zeeman effects assuming complete frequency redistribution, either using two-level or multilevel atomic models. The numerical method of solution used to find the self-consistent values of the atomic density matrix at each point of the model’s Cartesian grid is based on Jacobi iterative scheme and on a short-characteristics formal solver of the Stokes-vector transfer equation that uses monotonic Bézier interpolation. The code can also be used to compute the linear polarization of the continuum radiation caused by Rayleigh and Thomson scattering in 3D models of stellar atmospheres, and to solve the simpler 3D radiative transfer problem of unpolarized radiation in multilevel systems. PORTA accepts/produces HDF5 input/output and offers an advanced graphical user interface.
Permanent Link: https://hdl.handle.net/11104/0332732