The SUMER Ly-alpha line profile in quiescent prominences

doi:10.1051/0004-6361/200913875

CORC > 北京大学 > 地球与空间科学学院

	The SUMER Ly-alpha line profile in quiescent prominences
	Curdt, W. ; Tian, H. ; Teriaca, L. ; Schuehle, U.
刊名	astronomy astrophysics
	2010
关键词	Sun: UV radiation Sun: filaments, prominences line: formation line: profiles opacity MAGNETIC EQUILIBRIUM 2-DIMENSIONAL MODELS HYDROGEN SPECTRUM FINE-STRUCTURES LYMAN-ALPHA QUIET SUN SOHO/SUMER FEATURES ATLAS
DOI	10.1051/0004-6361/200913875
英文摘要	Aims. As the result of a novel observing technique, we publish for the first time SoHO-SUMER observations of the true spectral line profile of hydrogen Lyman-alpha in quiescent prominences. Because SoHO is not in Earth orbit, our high-quality data set is free of geocoronal absorption. We studied the line profile to complement earlier observations of the higher Lyman lines and to substantiate recent model predictions. Methods. We applied the reduced-aperture observing mode to two prominence targets and did a statistical analysis of the line profiles in both data sets. In particular, we investigated the shape of the profile, the radiance distribution, and the line shape-to-radiance interrelation. We also compared Ly-alpha data to co-temporal lambda 1206 Si III data. Results. We find that the average profile of Ly-alpha has a blue-peak dominance and is reversed more if the line-of-sight is perpendicular to the field lines. The contrast of Ly-alpha prominence emission rasters is very low, and the radiance distribution differs from the log-normal distribution of the disk. Features in the Si III line are not always co-spatial with Ly-alpha emission. Conclusions. Our empirical results support recent multi-thread models, which predict that asymmetries and depths of the self-reversal depend on the orientation of the prominence axis relative to the line-of-sight.; Astronomy & Astrophysics; SCI(E); EI; 5; ARTICLE; 3; 511
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/396280]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Curdt, W.,Tian, H.,Teriaca, L.,et al. The SUMER Ly-alpha line profile in quiescent prominences[J]. astronomy astrophysics,2010.
APA	Curdt, W.,Tian, H.,Teriaca, L.,&Schuehle, U..(2010).The SUMER Ly-alpha line profile in quiescent prominences.astronomy astrophysics.
MLA	Curdt, W.,et al."The SUMER Ly-alpha line profile in quiescent prominences".astronomy astrophysics (2010).