| タイトル | Using Prominence Mass Inferences in Different Coronal Lines to Obtain the He/H Abundance |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090023868 |
| 著者（英） | Gilbert, Holly; Kilper, Gary; Kucera, Therese; Alexander, David |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2009-06-14 |
| 言語 | eng |
| 内容記述 | In a previous study we developed a new technique for deriving prominence mass by observing how much coronal radiation in the Fe XII (lambda195) spectral Line is absorbed by prominence material. In the present work we apply this method. which allows us to consider the effects of both foreground and background radiation in our calculations, to a sample of prominences absorbing in a coronal line that ionizes both H and He (lambda < 504 Angstroms), and a line that ionizes only H (504 Angstroms < lambda < 911 Angstroms). This approach, first suggested by Mucera et al. (1998). permits the determination of the abundance ratio [He I]/[H I] of neutral helium and hydrogen in the prominence. This ratio should depend on how the prominence is formed, on its current thermodynamic state, and on its dynamical evolution. Thus, it may provide useful insights into the formation and evolution of prominences. |
| NASA分類 | Astronomy |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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