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DOI | 10.1126/science.aat2236 |
Dust grains fall from Saturn's D-ring into its equatorial upper atmosphere | |
Mitchell, D. G.1; Perry, M. E.1; Hamilton, D. C.2; Westlake, J. H.1; Kollmann, P.1; Smith, H. T.1; Carbary, J. F.1; Waite, J. H., Jr.3,4; Perryman, R.3; Hsu, H. -W.5; Wahlund, J. -E.6; Morooka, M. W.6; Hadid, L. Z.6; Persoon, A. M.7; Kurth, W. S.7 | |
2018-10-05 | |
发表期刊 | SCIENCE
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ISSN | 0036-8075 |
EISSN | 1095-9203 |
出版年 | 2018 |
卷号 | 362期号:6410页码:50-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Sweden |
英文摘要 | The sizes of Saturn's ring particles range from meters (boulders) to nanometers (dust). Determination of the rings' ages depends on loss processes, including the transport of dust into Saturn's atmosphere. During the Grand Finale orbits of the Cassini spacecraft, its instruments measured tiny dust grains that compose the innermost D-ring of Saturn. The nanometer-sized dust experiences collisions with exospheric (upper atmosphere) hydrogen and molecular hydrogen, which forces it to fall from the ring into the ionosphere and lower atmosphere. We used the Magnetospheric Imaging Instrument to detect and characterize this dust transport and also found that diffusion dominates above and near the altitude of peak ionospheric density. This mechanism results in a mass deposition into the equatorial atmosphere of similar to 5 kilograms per second, constraining the age of the D-ring. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000446547100036 |
WOS关键词 | CASSINI ; IONOSPHERE ; MODEL |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
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/199731 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA; 2.Univ Maryland, Dept Phys, College Pk, MD 20742 USA; 3.Southwest Res Inst, Div Space Sci & Engn, San Antonio, TX USA; 4.Univ Texas San Antonio, San Antonio, TX USA; 5.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 6.Swedish Inst Space Sci, Uppsala, Sweden; 7.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA |
推荐引用方式 GB/T 7714 | Mitchell, D. G.,Perry, M. E.,Hamilton, D. C.,et al. Dust grains fall from Saturn's D-ring into its equatorial upper atmosphere[J]. SCIENCE,2018,362(6410):50-+. |
APA | Mitchell, D. G..,Perry, M. E..,Hamilton, D. C..,Westlake, J. H..,Kollmann, P..,...&Kurth, W. S..(2018).Dust grains fall from Saturn's D-ring into its equatorial upper atmosphere.SCIENCE,362(6410),50-+. |
MLA | Mitchell, D. G.,et al."Dust grains fall from Saturn's D-ring into its equatorial upper atmosphere".SCIENCE 362.6410(2018):50-+. |
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