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DOI | 10.1002/2017GL075106 |
Spatial Distribution and Properties of 0.1-100 keV Electrons in Jupiter's Polar Auroral Region | |
Ebert, R. W.1; Allegrini, F.1,2; Bagenal, F.3; Bolton, S. J.1; Connerney, J. E. P.4; Clark, G.5; Gladstone, G. R.1; Hue, V.1; Kurth, W. S.6; Levin, S.7; Louarn, P.8; Mauk, B. H.5; McComas, D. J.1,9,10; Paranicas, C.5; Reno, M.10; Saur, J.11; Szalay, J. R.9; Thomsen, M. F.12; Valek, P.1,2; Weidner, S.10; Wilson, R. J.3 | |
2017-09-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:18 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France; Germany |
英文摘要 | We present observations of 0.1-100 keV electrons from Juno's Jovian Auroral Distributions Experiment Electron instrument over Jupiter's polar auroral region for periods around four Juno perijoves (PJ1, PJ3, PJ4, and PJ5). The observations reveal regions containing magnetic field aligned beams of bidirectional electrons having broad energy distributions interspersed between beams of upward electrons with narrow, peaked energy distributions, regions void of these electrons, and regions dominated by penetrating radiation. The electrons show evidence of acceleration via parallel electric fields (inverted-V structures) and via stochastic processes (bidirectional distributions). The inverted-V structures shown here were observed from similar to 1.4 to 2.9 R-J and had spatial scales of hundreds to thousands of kilometers along Juno's trajectory. The upward electron energy flux was typically greater than the downward flux, the latter ranging between similar to 0.01 and 5 mW m(-2) for two cases shown here which we estimate could produce similar to 0.1-50 kR of ultraviolet emission. Plain Language Summary We report on observations of 0.1 - 100 kilo-electron volt electrons from the Jovian Auroral Distributions Experiment Electron instrument (JADE-E) on Juno over the region where Jupiter's ultraviolet (UV) polar aurora is produced. The observations show electrons moving both towards and away from Jupiter. These electrons show both broad and narrow energy distributions, suggesting the presence of at least two different acceleration mechanisms. Regions void of these electrons and regions dominated by penetrating radiation were also identified. The energy flux of the electrons moving towards Jupiter was sufficient to produce the weaker UV polar auroral emissions observed at Jupiter but a different source of electrons, likely with higher energies, is required to account for the brighter emissions. |
英文关键词 | Jupiter polar magnetosphere polar aurora electron acceleration parallel electric fields Juno |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413148100011 |
WOS关键词 | FAST SATELLITE-OBSERVATIONS ; JOVIAN AURORA ; MAGNETOSPHERE ; BEAMS |
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/25509 |
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 USA; 3.Univ Colorado Boulder, Atmospher & Space Phys Lab, Boulder, CO USA; 4.Goddard Space Flight Ctr, Greenbelt, MD USA; 5.Johns Hopkins Univ, Appl Phys Lab, Laurel, 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.Princeton Univ, Princeton Plasma Phys Lab, Off Vice President, POB 451, Princeton, NJ 08543 USA; 11.Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany; 12.Planetary Sci Inst, Tucson, AZ USA |
推荐引用方式 GB/T 7714 | Ebert, R. W.,Allegrini, F.,Bagenal, F.,et al. Spatial Distribution and Properties of 0.1-100 keV Electrons in Jupiter's Polar Auroral Region[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(18). |
APA | Ebert, R. W..,Allegrini, F..,Bagenal, F..,Bolton, S. J..,Connerney, J. E. P..,...&Wilson, R. J..(2017).Spatial Distribution and Properties of 0.1-100 keV Electrons in Jupiter's Polar Auroral Region.GEOPHYSICAL RESEARCH LETTERS,44(18). |
MLA | Ebert, R. W.,et al."Spatial Distribution and Properties of 0.1-100 keV Electrons in Jupiter's Polar Auroral Region".GEOPHYSICAL RESEARCH LETTERS 44.18(2017). |
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