Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL081129 |
Comparing Electron Energetics and UV Brightness in Jupiter's Northern Polar Region During Juno Perijove 5 | |
Ebert, R. W.1,2; Greathouse, T. K.1; Clark, G.3; Allegrini, F.1,2; Bagenal, F.4; Bolton, S. J.1; Connerney, J. E. P.5; Gladstone, G. R.1,2; Imai, M.6; Hue, V.1; Kurth, W. S.6; Levin, S.7; Louarn, P.8; Mauk, B. H.3; McComas, D. J.1,9; Paranicas, C.3; Szalay, J. R.9; Thomsen, M. F.10; Valek, P. W.1; Wilson, R. J.4 | |
2019-01-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:1页码:19-27 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | We compare electron and UV observations mapping to the same location in Jupiter's northern polar region, poleward of the main aurora, during Juno perijove 5. Simultaneous peaks in UV brightness and electron energy flux are identified when observations map to the same location at the same time. The downward energy flux during these simultaneous observations was not sufficient to generate the observed UV brightness; the upward energy flux was. We propose that the primary acceleration region is below Juno's altitude, from which the more intense upward electrons originate. For the complete interval, the UV brightness peaked at 240kilorayleigh (kR); the downward and upward energy fluxes peaked at 60 and 700mW/m(2), respectively. Increased downward energy fluxes are associated with increased contributions from tens of keV electrons. These observations provide evidence that bidirectional electron beams with broad energy distributions can produce tens to hundreds of kilorayleigh polar UV emissions. Plain Language Summary Jupiter's ultraviolet (UV) aurora is produced by electrons that precipitate into the planet's atmosphere and interact with hydrogen molecules. A number of different UV auroral emission regions have been identified such as the main aurora, the aurora associated with Jupiter's satellites, and the polar aurora located poleward of the main aurora. We examine electron and UV observations from Juno in Jupiter's northern polar region to investigate the processes responsible for producing Jupiter's polar aurora. We show electrons and UV emissions having simultaneous enhancements during a time when they map to the same location of Jupiter's upper atmosphere at the same time. We present evidence that electrons with energies between 0.1 and 100 kilo electron volts (keV) are capable of producing the polar UV emissions studied here and that further acceleration of these electrons may be occurring at altitudes below the spacecraft. |
英文关键词 | Juno Jupiter' s aurora polar auroral region polar UV emissions precipitating electrons electron energy flux |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456938600003 |
WOS关键词 | MODEL |
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/27912 |
专题 | 气候变化 |
作者单位 | 1.Southwest Res Inst, San Antonio, TX 78238 USA; 2.Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA; 3.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA; 4.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 5.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA; 6.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA; 7.Jet Prop Lab, Pasadena, CA USA; 8.Inst Rech Astrophys & Planetol, Toulouse, France; 9.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA; 10.Planetary Sci Inst, Tucson, AZ USA |
推荐引用方式 GB/T 7714 | Ebert, R. W.,Greathouse, T. K.,Clark, G.,et al. Comparing Electron Energetics and UV Brightness in Jupiter's Northern Polar Region During Juno Perijove 5[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(1):19-27. |
APA | Ebert, R. W..,Greathouse, T. K..,Clark, G..,Allegrini, F..,Bagenal, F..,...&Wilson, R. J..(2019).Comparing Electron Energetics and UV Brightness in Jupiter's Northern Polar Region During Juno Perijove 5.GEOPHYSICAL RESEARCH LETTERS,46(1),19-27. |
MLA | Ebert, R. W.,et al."Comparing Electron Energetics and UV Brightness in Jupiter's Northern Polar Region During Juno Perijove 5".GEOPHYSICAL RESEARCH LETTERS 46.1(2019):19-27. |
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