The Morphology of the Topside Martian Ionosphere: Implications on Bulk Ion Flow
文献类型：期刊论文
| 作者 | Wu, X. -S.1,2; Cui, J.1,2,3; Xu, S. S.4; Lillis, R. J.4; Yelle, R. V.5; Edberg, N. J. T.6; Vigren, E.6; Rong, Z. -J.7; Fan, K.7; Guo, J. -P.3 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
 |
| 出版日期 | 2019-03-01 |
| 卷号 | 124期号:3页码:734-751 |
| ISSN号 | 2169-9097 |
| 关键词 | Martian ionosphere ion outflow magnetic pressure crustal magnetic anomalies |
| DOI | 10.1029/2018JE005895 |
| 英文摘要 | Prior to the Mars Atmosphere and Volatile Evolution mission, the only information on the composition of the Martian ionosphere came from the Viking Retarding Potential Analyzer data, revealing the presence of substantial ion outflow on the dayside of Mars. Extensive measurements made by the Mars Atmosphere and Volatile Evolution Neutral Gas and Ion Mass Spectrometer allow us to examine the morphology of the Martian ionosphere not only in unprecedented detail but also on both the dayside and the nightside of the planet. Above 300km, various ionospheric species present a roughly constant density scale height around 100km on the dayside and 180km on the nightside. An evaluation of the ion force balance, appropriate for regions with near-horizontal magnetic field lines, suggests the presence of supersonic ion outflow predominantly driven by the ambient magnetic pressure, with characteristic dayside and nightside flow velocities of 4 and 20km/s, respectively, both referred to an altitude of 500km. The corresponding total ion outflow rates are estimated to be 5x10(25)s(-1) on the dayside and 1x10(25)s(-1) on the nightside. The data also indicate a prominent variation with magnetic field orientation in that the ion distribution over regions with near-vertical field lines tends to be more extended on the dayside but more concentrated on the nightside, as compared to regions with near-horizontal field lines. These observations should have important implications on the pattern of ion dynamics in the vicinity of Mars. Plain Language Summary Prior to the Mars Atmosphere and Volatile Evolution mission, the only information on the composition of the Martian ionosphere came from the Viking Retarding Potential Analyzer data acquired on the dayside of Mars. Recently, extensive measurements made by the Mars Atmosphere and Volatile Evolution Neutral Gas and Ion Mass Spectrometer allow us to examine the Martian ionosphere not only in unprecedented detail but also on both the dayside and the nightside of the planet. By analyzing these data, we find that on each side, many of the detected ion species share a common density structure at altitudes above 300km. Meanwhile, such a structure is clearly influenced by the ambient magnetic fields, which are well known to be inhomogeneous on Mars and cluster over the Southern Hemisphere. Near strong magnetic fields, the Martian ionosphere tends to be more extended on the dayside but more concentrated on the nightside. These findings reveal the presence of supersonic ion outflow on Mars. Such an ion outflow makes a significant contribution to plasma escape, which influences the long-term evolution of the planet. |
| WOS关键词 | CRUSTAL MAGNETIC-FIELD ; MARS GLOBAL SURVEYOR ; MULTISPECIES MAGNETOHYDRODYNAMIC MODEL ; SUPRATHERMAL ELECTRON DEPLETIONS ; DENSITY PROFILES ANALYSIS ; SOLAR-WIND INTERACTION ; DAYSIDE IONOSPHERE ; RADAR SOUNDINGS ; MAVEN ; EXPRESS |
| 资助项目 | National Natural Science Foundation of China[41525015] ; National Natural Science Foundation of China[41774186] ; National Natural Science Foundation of China[41525016] ; Science and Technology Development Fund of Macau SAR[039/2013/A2] ; Science and Technology Development Fund of Macau SAR[119/2017/A3] ; National Aeronautics and Space Administration (NASA) ; Swedish National Space Agency[135/13] ; Swedish National Space Agency[166/14] ; Swedish Research Council (VR grant)[621-2013-4191] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000463994500005 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; Science and Technology Development Fund of Macau SAR ; National Aeronautics and Space Administration (NASA) ; National Aeronautics and Space Administration (NASA) ; Swedish National Space Agency ; Swedish National Space Agency ; Swedish Research Council (VR grant) ; Swedish Research Council (VR grant) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; Science and Technology Development Fund of Macau SAR ; National Aeronautics and Space Administration (NASA) ; National Aeronautics and Space Administration (NASA) ; Swedish National Space Agency ; Swedish National Space Agency ; Swedish Research Council (VR grant) ; Swedish Research Council (VR grant) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; Science and Technology Development Fund of Macau SAR ; National Aeronautics and Space Administration (NASA) ; National Aeronautics and Space Administration (NASA) ; Swedish National Space Agency ; Swedish National Space Agency ; Swedish Research Council (VR grant) ; Swedish Research Council (VR grant) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; Science and Technology Development Fund of Macau SAR ; National Aeronautics and Space Administration (NASA) ; National Aeronautics and Space Administration (NASA) ; Swedish National Space Agency ; Swedish National Space Agency ; Swedish Research Council (VR grant) ; Swedish Research Council (VR grant) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/91285]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Cui, J. |
| 作者单位 | 1.Chinese Acad Sci, CAS Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China 2.Chinese Acad Sci, CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China 3.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Peoples R China 4.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA 5.Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA 6.Swedish Inst Space Phys, Uppsala, Sweden 7.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, X. -S.,Cui, J.,Xu, S. S.,et al. The Morphology of the Topside Martian Ionosphere: Implications on Bulk Ion Flow[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2019,124(3):734-751. |
| APA | Wu, X. -S..,Cui, J..,Xu, S. S..,Lillis, R. J..,Yelle, R. V..,...&Mitchell, D. L..(2019).The Morphology of the Topside Martian Ionosphere: Implications on Bulk Ion Flow.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,124(3),734-751. |
| MLA | Wu, X. -S.,et al."The Morphology of the Topside Martian Ionosphere: Implications on Bulk Ion Flow".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 124.3(2019):734-751. |
入库方式： OAI收割
来源：地质与地球物理研究所
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