Line profiles and intensity ratios in prominence models with a prominence to corona interface

TitleLine profiles and intensity ratios in prominence models with a prominence to corona interface
Publication TypeConference Paper
Year of Publication2002
AuthorsLabrosse, N., Gouttebroze P., Heinzel P., and Vial J.-C.
EditorWilson, A.
Conference NameSolar Variability: From Core to Outer Frontiers
Date PublishedDec
Abstract

In this work we study the hydrogen, helium and calcium spectra emitted by a one-dimensional prominence model in magneto-hydrostatic equilibrium. The prominence slab consists of two parts: a cool core where the plasma is optically thick for some lines, and a prominence-to-corona transition region (PCTR) with a strong temperature gradient. The models are defined by 5 parameters: temperature, pressure, slab thickness, microturbulent velocity and altitude. We solve the NLTE radiative transfer equations for all optically thick transitions. We present line ratios between infrared, optical and EUV lines, as well as line profiles. We show that the presence of a PCTR, where both collisional and radiative excitations are important, affects H, He, and Ca populations and emergent lines in different manners.