Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL078575 |
Material Flux From the Rings of Saturn Into Its Atmosphere | |
Perry, M. E.1; Waite, J. H., Jr.2; Mitchell, D. G.1; Miller, K. E.2; Cravens, T. E.3; Perryman, R. S.2; Moore, L.4; Yelle, R. V.5; Hsu, H. -W.6; Hedman, M. M.7; Cuzzi, J. N.8; Strobel, D. F.9; Hamil, O. Q.3; Glein, C. R.2; Paxton, L. J.1; Teolis, B. D.2; McNutt, R. L., Jr.1 | |
2018-10-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:19页码:10093-10100 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | During Cassini's final, spectacular months, in situ instruments made the first direct measurements of nanoparticles, finding an exceptionally large flow from the rings into Saturn's atmosphere. Cassini's Ion and Neutral Mass Spectrometer measured material in three altitude bands and found a global-integrated flux of 2-20 x 10(4) kg/s that is dominated by hydrocarbon material <10(4)u. Ranging from clusters of a few molecules to radii of several nanometers, nanoparticles are ubiquitous throughout Saturn's rings but embedded in the regolith of larger particles and not detectable as independent particles using remote observations. The smallest nanoparticles are susceptible to atmosphere drag by Saturn's tenuous exosphere that reaches the inner edge of the D ring. The unsustainable large flux suggests a recent disturbance of Saturn's inner ring material, possibly associated with the clumping that appeared in the D68 ringlet in 2015. Plain Language Summary For 40 years, calculations based on remote observations indicated that Saturn's magnetic field carries ions and charged particles from the rings to the midlatitudes of Saturn. In Cassini's last few months of life, direct, in situ measurements found that 10 tons/s of molecules and particles smaller than two nanometers are streaming along the plane of the rings into Saturn's atmosphere by another process: atmospheric drag. Saturn's extended atmosphere reaches the inner edge of Saturn's rings and extracts neutral particles less than one thousandth the thickness of a human hair by slowing them down until they fall into Saturn. Surprisingly, the flux is a hundred times larger than past predictions, and at least half of the material is hydrocarbon, which comprises less than 5% of the water ice-dominated rings. Cassini's data also show that the influx varies at least a factor of 4 and may be linked to clumps that appeared in 2015 on D68, the ringlet on the inner edge of the rings. These newly discovered particles and processes alter the evolutionary landscape of the rings and provide an exciting, rich field for future research aimed at understanding the origin and history of the rings. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448656800008 |
WOS关键词 | GRAINS ; MODEL ; EVOLUTION ; INFLUX ; WATER ; FATE |
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/26749 |
专题 | 气候变化 |
作者单位 | 1.Johns Hopkins Appl Phys Lab, Laurel, MD 20723 USA; 2.Southwest Res Inst, San Antonio, TX USA; 3.Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA; 4.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 5.Univ Arizona, Dept Planetary Sci, Tucson, AZ 85721 USA; 6.Univ Colorado, LASP, Boulder, CO 80309 USA; 7.Univ Idaho, Dept Phys, Moscow, ID USA; 8.NASA, Ames Res Ctr, Mountain View, CA USA; 9.Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA |
推荐引用方式 GB/T 7714 | Perry, M. E.,Waite, J. H., Jr.,Mitchell, D. G.,et al. Material Flux From the Rings of Saturn Into Its Atmosphere[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(19):10093-10100. |
APA | Perry, M. E..,Waite, J. H., Jr..,Mitchell, D. G..,Miller, K. E..,Cravens, T. E..,...&McNutt, R. L., Jr..(2018).Material Flux From the Rings of Saturn Into Its Atmosphere.GEOPHYSICAL RESEARCH LETTERS,45(19),10093-10100. |
MLA | Perry, M. E.,et al."Material Flux From the Rings of Saturn Into Its Atmosphere".GEOPHYSICAL RESEARCH LETTERS 45.19(2018):10093-10100. |
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