| タイトル | Does Velocity Redistribution Really Enhance the HE 304 A Line to Observed Intensities? |
| 本文（外部サイト） | http://hdl.handle.net/2060/19990109148 |
| 著者（英） | Brosius, Jeffrey; Jordan, Stuart; Behring, William; Garcia, Adriana; Andretta, Vincenzo |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1999-01-01 |
| 言語 | eng |
| 内容記述 | Previous work by this group has demonstrated that small-scale nonthermal velocities probably play a significant role in enhancing the intensity of the He II 304 A line above values predicted by the static atmosphere NLTE theories, and more in conformity with Skylab and SOHO observations. This presentation briefly summarizes the evidence for this conclusion, emphasizing SOHO and correlated groundbased observations, of which examples are presented. However, in contrast to the previous studies, the tact taken here is more critical, asking the question "Can velocity redistribution fully explain the observations of the 304 A line, and what counter-indications and problems remain?" The conclusion reached is that, while velocity redistribution plays a significant role in the intensity enhancement, it may not be the whole story. Some other mechanism, associated with velocity filtration, may be at work. |
| NASA分類 | Astronomy |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/227631 |
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