Description
Non-LTE radiative transfer in 2D was performed for the hydrogen plasma of a loop-like structure within eruptive prominence obtained by 3D MHD simulation. The simulation made by Fan & Liu (2019) shows evolution of a prominence from quasi-equilibrium to the onset of eruption of a twisted, prominence forming coronal magnetic flux rope which underlays a coronal streamer. The 180th time step of the simulation is particularly suitable for our modeling because the prominence loop is already well formed at this time, is symmetric and not yet twisted. The loop is divided into several segments located from its bottom to its top. Cuts across each of the segments were made and distributions of the temperature and gas pressure within individual 2D cuts are taken as an input for our transfer code. Synthetic profiles of the Lyman alpha line are calculated for each segment using the formal solution of radiative transfer along the line of sight. The segments are approximated by 2D slabs with two finite dimensions across the loop and one infinite along it. The slab is irradiated from its bottom and sides, except of a vertical segment which is irradiated from all sides. Radiative transfer is solved by short characteristics method with usage of the Multilevel Accelerated Lambda Iterations and 5-level plus continuum hydrogen atom. The current version of the code is based on versions developed in Heinzel & Anzer (2001) and Schwartz et al. (2019). In the version used here, any desirable inclination of the slab can be used.
