PREDNASAJUCI / LECTURER :

Pavol Schwartz

(1) Astronomical Institute, Slovak Academy of Sciences,
059 60 Tatranská Lomnica

NAZOV / TITLE :

Synthetic hydrogen Lyman-alpha images from 3D MHD simulation of an
eruptive prominence: Towards analysis of Solar Orbiter/Metis observations

ABSTRAKT / ABSTRACT :

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.