Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...490..307g&link_type=abstract
Astronomy and Astrophysics, Volume 490, Issue 1, 2008, pp.307-313
Astronomy and Astrophysics
Astrophysics
16
Sun: Prominences, Radiative Transfer, Line: Profiles
Scientific paper
Aims: We study the asymmetries of the synthetic hydrogen Lyman lines and the process responsible for their formation. 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. 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-1. Moreover, our results indicate that the synthetic Lyman-α profiles may exhibit an opposite asymmetry to that of the higher Lyman lines. Conclusions: The presence and behaviour of the asymmetrical profiles of the synthetic Lyman lines agree with observed profiles acquired by SUMER.
Appendix A is only available in electronic form at http://www.aanda.org
Anzer Ulrich
Gunar S.
Heinzel Petr
Schmieder Brigitte
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