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DOI | 10.1029/2018GL078020 |
Electron Density Distributions in Saturn's Ionosphere | |
Persoon, A. M.1; Kurth, W. S.1; Gurnett, D. A.1; Groene, J. B.1; Sulaiman, A. H.1; Wahlund, J. -E.2; Morooka, M. W.2; Hadid, L. Z.2; Nagy, A. F.3; Waite, J. H.4; Cravens, T. E.5 | |
2019-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:6页码:3061-3068 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Sweden |
英文摘要 | Between 26 April and 15 September 2017, Cassini executed 23 highly inclined Grand Finale orbits through a new frontier for space exploration, the narrow region between Saturn and the D Ring, providing the first opportunity for obtaining in situ ionospheric measurements. During the Grand Finale orbits, the Radio and Plasma Wave Science instrument observed broadband whistler mode emissions and narrowband upper hybrid frequency emissions. Using known wave propagation characteristics of these two plasma wave modes, the electron density is derived over a broad range of ionospheric latitudes and altitudes. A two-part exponential scale height model is fitted to the electron density measurements. The model yields a double-layered ionosphere with plasma scale heights of 545/575 km for the northern/southern hemispheres below 4,500 km and plasma scale heights of 4,780/2,360 km for the northern/southern hemispheres above 4,500 km. The interpretation of these layers involves the interaction between the rings and the ionosphere. Plain Language Summary For the final 5 months of the Cassini mission in 2017, the spacecraft executed 23 orbits through a new frontier for space exploration, the narrow region between Saturn and the innermost of Saturn's main rings, the D Ring. For the first time in the history of space exploration, the Cassini instruments were able to take measurements inside Saturn's ionosphere. This paper provides the density distribution of Saturn's ionospheric electrons, derived from plasma waves detected by the Radio and Plasma Wave Science instrument. The electron density distributions with altitude and latitude show that the ionospheric electron densities peak at 10,000 particles per cubic centimeter at low altitudes in the equatorial region and drop below 100 particles per cubic centimeter at higher altitudes and latitudes. Two simple ionospheric scale height density models for the northern and southern hemispheres are presented. |
英文关键词 | Saturn Saturn' s ionosphere ionospheric layers electron densities plasma scale height scale height density model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464650400006 |
WOS关键词 | RADIO ; MAGNETOSPHERE ; ATMOSPHERE |
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/181753 |
专题 | 气候变化 |
作者单位 | 1.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA; 2.Swedish Inst Phys, Uppsala, Sweden; 3.Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA; 4.Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA; 5.Univ Kansas, Dept Phys & Astron, Lawrence, KS USA |
推荐引用方式 GB/T 7714 | Persoon, A. M.,Kurth, W. S.,Gurnett, D. A.,et al. Electron Density Distributions in Saturn's Ionosphere[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(6):3061-3068. |
APA | Persoon, A. M..,Kurth, W. S..,Gurnett, D. A..,Groene, J. B..,Sulaiman, A. H..,...&Cravens, T. E..(2019).Electron Density Distributions in Saturn's Ionosphere.GEOPHYSICAL RESEARCH LETTERS,46(6),3061-3068. |
MLA | Persoon, A. M.,et al."Electron Density Distributions in Saturn's Ionosphere".GEOPHYSICAL RESEARCH LETTERS 46.6(2019):3061-3068. |
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