Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization
文献类型：期刊论文
| 作者 | Zhang,Q.5,6; Gu,H.4; Cui,J.2,3; Cheng,Y.-M.5,6; He,Z.-G.2,3; Zhong,J.-H.3; He,F.1; Wei,Y.1 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2020-01-20 |
| 卷号 | 159期号:2 |
| 关键词 | Planetary atmospheres Upper atmosphere Electron impact ionization |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/ab6297 |
| 英文摘要 | Abstract Neutral escape on Mars is well known to be dominated by atomic oxygen (O) escape via the dissociative recombination (DR) of , the most abundant ion species in the Martian upper atmosphere. In this study, we suggest an alternative mechanism due to the impact excitation and ionization of CO2 by photoelectrons on the dayside or precipitating solar wind electrons on the nightside. These electron impact (EI) processes are capable of producing hot O atoms via the predissociation of CO2 and in electronically excited states. An evaluation with the aid of the combined data set accumulated by several instruments on board the Mars Atmosphere and Volatile Evolution spacecraft reveals that CO2 EI makes a non-negligible contribution to total atomic O escape on Mars, with a median EI-to-DR escape flux ratio of 10% on the dayside and 20% on the nightside. CO2 EI is found to be able to drive stronger O escape than atmospheric sputtering, an alternative escape mechanism well studied on Mars. Our results highlight the importance of a neutral escape mechanism largely ignored in previous studies. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-6256-159-2-AB6297 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28715]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China 2.Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Hefei, Anhui, People’s Republic of China 3.School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, People’s Republic of China 4.Space Science Institute, Macau University of Science and Technology, Macau, People’s Republic of China 5.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, People’s Republic of China 6.Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Zhang,Q.,Gu,H.,Cui,J.,et al. Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization[J]. The Astronomical Journal,2020,159(2). |
| APA | Zhang,Q..,Gu,H..,Cui,J..,Cheng,Y.-M..,He,Z.-G..,...&Wei,Y..(2020).Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization.The Astronomical Journal,159(2). |
| MLA | Zhang,Q.,et al."Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization".The Astronomical Journal 159.2(2020). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。