17 citations · 37 across the 7 of their papers we have counts for
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Possible creation of net circular polarization and not only depolarization of spectral lines by isotropic collisions
Jiri Stepan, Sylvie Sahal-Brechot
We will show that isotropic collisions of electrons and protons with neutral hydrogen can lead to creation of net orientation of the atomic levels in the presence of a magnetic fie…
Hydrogen Balmer line formation in solar flares affected by return currents
Jiri Stepan, Jana Kasparova, Marian Karlicky +1
Aims. We investigate the effect of the electric return currents in solar flares on the profiles of hydrogen Balmer lines. We consider the monoenergetic approximation for the primar…
Polarization diagnostics of proton beams in solar flares
Jiri Stepan
We review the problem of proton beam bombardment of solar chromosphere considering the self-consistent NLTE polarized radiation transfer in hydrogen lines. Several observations ind…
Hydrogen H line polarization in solar flares. Theoretical investigation of atomic polarization by proton beams considering self-consistent NLTE polarized radiative transfer
Jiri Stepan, Petr Heinzel, Sylvie Sahal-Brechot
Context. We present a theoretical review of the effect of impact polarization of a hydrogen H line due to an expected proton beam bombardment in solar flares. Aims. Several obse…
Multigrid Methods for Polarized Radiative Transfer
Jiri Stepan
A new iterative method for non-LTE multilevel polarized radiative transfer in hydrogen lines is presented. Iterative methods (such as the Jacobi method) tend to damp out high-frequ…