Accueil > Publications > Catalogue POP > 2019

Catalogue POP – Notice individuelle de publication

Gunár Stanislav, Heinzel Petr, Anzer U., Schmieder Brigitte

On Lyman-line asymmetries in quiescent prominences

Astronomy and Astrophysics, 2008, vol. 490, pp. 307-313

Référence DOI : 10.1051/0004-6361:200810127
Référence ADS : 2008A&A...490..307G

Résumé :

Aims: We study the asymmetries of the synthetic hydrogen Lyman lines and the process responsible for their formation. <BR />Methods: To obtain the synthetic Lyman line profiles, we use a multi-thread prominence fine-structure model consisting of identical 2D threads. The 2D thread models are in MHS equilibrium, include an empirical prominence-corona transition region, and solve consistently 2D non-LTE radiative transfer. Each thread of the multi-thread model has a randomly assigned line-of-sight (LOS) velocity. <BR />Results: The synthetic Lyman spectrum obtained by multi-thread modelling exhibits substantial asymmetries of the line profiles, even though the LOS velocities of individual threads are only of the order of 10 km s<SUP>-1</SUP>. Moreover, our results indicate that the synthetic Lyman-alpha profiles may exhibit an opposite asymmetry to that of the higher Lyman lines. <BR />Conclusions: The presence and behaviour of the asymmetrical profiles of the synthetic Lyman lines agree with observed profiles acquired by SUMER.

Retour au catalogue