Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN Deep Dip Campaigns
文献类型：期刊论文
| 作者 | Cui,J.2,3,4; Cao,Y.-T.3; Wu,X.-S.3,4; Xu,S.-S.5; Yelle,R. V.6; Stone,S.6; Vigren,E.1; Edberg,N. J. T.1; Shen,C.-L.4,7; He,F.8 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2019-05-03 |
| 卷号 | 876期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | planets and satellites: atmospheres planets and satellites: individual (Mars) |
| DOI | 10.3847/2041-8213/ab1b34 |
| 英文摘要 | Abstract Combining the Mars Atmosphere and Volatile Evolution (MAVEN) measurements of atmospheric neutral and ion densities, electron temperature, and energetic electron intensity, we perform the first quantitative evaluation of local ionization balance in the nightside Martian upper atmosphere, a condition with the electron impact ionization (EI) of CO2 exactly balanced by the dissociative recombination (DR) of ambient ions. The data accumulated during two MAVEN Deep Dip (DD) campaigns are included: DD6 on the deep nightside with a periapsis solar zenith angle (SZA) of 165°, and DD3 close to the dawn terminator with a periapsis SZA of 110°. With the electron temperatures at low altitudes corrected for an instrumental effect pertaining to the MAVEN Langmuir Probe and Waves, a statistical agreement between the EI and DR rates is suggested by the data below 140?km during DD6 and below 180?km during DD3, implying that electron precipitation is responsible for the nightside Martian ionosphere under these circumstances and extra sources are not required. In contrast, a substantial enhancement in EI over DR is observed at higher altitudes during both campaigns, which we interpret as a signature of plasma escape down the tail. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-876-1-AB1B34 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26049]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Swedish Institute of Space Physics, Uppsala, Sweden 2.School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, People’s Republic of China 3.Chinese Academy of Sciences Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Beijing, People’s Republic of China 4.Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Hefei, Anhui, People’s Republic of China 5.Space Sciences Laboratory, University of California, Berkeley, CA, USA 6.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA 7.School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, People’s Republic of China 8.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Cui,J.,Cao,Y.-T.,Wu,X.-S.,et al. Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN Deep Dip Campaigns[J]. The Astrophysical Journal Letters,2019,876(1). |
| APA | Cui,J..,Cao,Y.-T..,Wu,X.-S..,Xu,S.-S..,Yelle,R. V..,...&Wei,Y..(2019).Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN Deep Dip Campaigns.The Astrophysical Journal Letters,876(1). |
| MLA | Cui,J.,et al."Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN Deep Dip Campaigns".The Astrophysical Journal Letters 876.1(2019). |
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来源：国家天文台
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