Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL075431 |
Ion Densities in the Nightside Ionosphere of Mars: Effects of Electron Impact Ionization | |
Girazian, Z.1; Mahaffy, P.1; Lillis, R. J.2; Benna, M.1,3; Elrod, M.1,4; Fowler, C. M.5; Mitchell, D. L.2 | |
2017-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:22 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We use observations from the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission to show how superthermal electron fluxes and crustal magnetic fields affect ion densities in the nightside ionosphere of Mars. We find that due to electron impact ionization, high electron fluxes significantly increase the CO2+, O+, and O-2(+) densities below 200 km but only modestly increase the NO+ density. High electron fluxes also produce distinct peaks in the CO2+, O+, and O-2(+) altitude profiles. We also find that superthermal electron fluxes are smaller near strong crustal magnetic fields. Consequently, nightside ion densities are also smaller near strong crustal fields because they decay without being replenished by electron impact ionization. Furthermore, the NO+/O-2(+) ratio is enhanced near strong crustal fields because, in the absence of electron impact ionization, O-2(+) is converted into NO+ and not replenished. Our results show that electron impact ionization is a significant source of CO2+, O+, and O-2(+) in the nightside ionosphere of Mars. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419102300004 |
WOS关键词 | CRUSTAL MAGNETIC-FIELD ; SOLAR-WIND CONDITIONS ; MARTIAN IONOSPHERE ; MODEL ; VARIABILITY ; ATMOSPHERE ; DEPENDENCE ; EXPRESS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26881 |
专题 | 气候变化 |
作者单位 | 1.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 2.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 3.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 4.Univ Maryland Baltimore Cty, CRESST, Baltimore, MD 21228 USA; 5.Univ Maryland, CRESST, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Girazian, Z.,Mahaffy, P.,Lillis, R. J.,et al. Ion Densities in the Nightside Ionosphere of Mars: Effects of Electron Impact Ionization[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(22). |
APA | Girazian, Z..,Mahaffy, P..,Lillis, R. J..,Benna, M..,Elrod, M..,...&Mitchell, D. L..(2017).Ion Densities in the Nightside Ionosphere of Mars: Effects of Electron Impact Ionization.GEOPHYSICAL RESEARCH LETTERS,44(22). |
MLA | Girazian, Z.,et al."Ion Densities in the Nightside Ionosphere of Mars: Effects of Electron Impact Ionization".GEOPHYSICAL RESEARCH LETTERS 44.22(2017). |
条目包含的文件 | 条目无相关文件。 |
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。
修改评论