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DOI | 10.1029/2018GL078436 |
Titan's Variable Ionosphere During the T118 and T119 Cassini Flybys | |
Edberg, N. J. T.1; Vigren, E.1; Snowden, D.2; Regoli, L. H.3; Shebanits, O.1,4; Wahlund, J. -E.1; Andrews, D. J.1; Bertucci, C.5; Cui, J.6,7 | |
2018-09-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:17页码:8721-8728 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; USA; England; Argentina; Peoples R China |
英文摘要 | We report on unusual dynamics in Titan's ionosphere as a significant difference in ionospheric electron density is observed between the T118 and T119 Cassini nightside flybys. Two distinct nightside electron density peaks were present during T118, at 1,150 and 1,200km, and the lowest density ever observed in Titan's ionosphere at altitudes 1,000-1,350km was during T118. These flybys were quite similar in geometry, Saturn local time, neutral density, extreme ultraviolet flux, and ambient magnetic field conditions. Despite this, the Radio and Plasma Waves/Langmuir Probe measured a density difference up to a factor of 6 between the passes. The overall difference was present and similar during both inbound and outbound legs. By ruling out other factors, we suggest that an exceptionally low rate of particle impact ionization in combination with dynamics in the ionosphere is the explanation for the observations. Plain Language Summary Using the Cassini satellite in orbit around Saturn, we make measurements during two close passes of the moon Titan. We observe how the electron density in the uppermost part of the moon's atmosphere-the ionosphere-changes drastically from one pass to the next. We also observe unexpectedly high peaks of electron density in a specific altitude range during the first pass. The findings are attributed to low influx of charged particles from Saturn's magnetosphere as well as to increased dynamics of the plasma in the ionosphere. The study emphasizes the complexity of the physical process at play at the moon and aims at gaining further understanding of this environment. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445727500003 |
WOS关键词 | UPPER-ATMOSPHERE ; THERMAL STRUCTURE ; ION ; PLASMA ; SPECTROMETER ; DENSITIES ; BALANCE ; RADIO |
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/27358 |
专题 | 气候变化 |
作者单位 | 1.Swedish Inst Space Phys, Uppsala, Sweden; 2.Cent Washington Univ, Dept Phys, Ellensburg, WA USA; 3.Univ Michigan, Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA; 4.Imperial Coll London, Dept Phys, London, England; 5.IAFE, Ciudad Univ, Buenos Aires, DF, Argentina; 6.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Peoples R China; 7.Chinese Acad Sci, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Edberg, N. J. T.,Vigren, E.,Snowden, D.,et al. Titan's Variable Ionosphere During the T118 and T119 Cassini Flybys[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(17):8721-8728. |
APA | Edberg, N. J. T..,Vigren, E..,Snowden, D..,Regoli, L. H..,Shebanits, O..,...&Cui, J..(2018).Titan's Variable Ionosphere During the T118 and T119 Cassini Flybys.GEOPHYSICAL RESEARCH LETTERS,45(17),8721-8728. |
MLA | Edberg, N. J. T.,et al."Titan's Variable Ionosphere During the T118 and T119 Cassini Flybys".GEOPHYSICAL RESEARCH LETTERS 45.17(2018):8721-8728. |
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