| タイトル | The Extreme-ultraviolet Emission from Sun-grazing Comets |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140002244 |
| 著者（英） | Pesnell, William D.; Bryans, Paul |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2012-10-30 |
| 言語 | eng |
| 内容記述 | The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses.We explain this EUV emission by considering the evolution of the cometary atmosphere as it interacts with the ambient solar atmosphere. Molecules in the comet rapidly sublimate as it approaches the Sun. They are then photodissociated by the solar radiation field to create atomic species. Subsequent ionization of these atoms produces a higher abundance of ions than normally present in the corona and results in EUV emission in the wavelength ranges of the AIA telescope passbands. |
| NASA分類 | Solar Physics |
| レポートNO | GSFC-E-DAA-TN8955 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
