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DOI | 10.1029/2019GL086527 |
Alfvenic Acceleration Sustains Ganymede's Footprint Tail Aurora | |
Szalay, J. R.1; Allegrini, F.2,3; Bagenal, F.4; Bolton, S. J.2; Bonfond, B.5; Clark, G.6; Connerney, J. E. P.7,8; Ebert, R. W.2,3; Gershman, D. J.8; Giles, R. S.2; Gladstone, G. R.2; Greathouse, T.2; Hospodarsky, G. B.9; Imai, M.9; Kurth, W. S.9; Kotsiaros, S.8; Louarn, P.10; McComas, D. J.1; Saur, J.11; Sulaiman, A. H.9; Wilson, R. J.4 | |
2020-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Belgium; France; Germany |
英文摘要 | Integrating simultaneous in situ measurements of magnetic field fluctuations, precipitating electrons, and ultraviolet auroral emissions, we find that Alfvenic acceleration mechanisms are responsible for Ganymede's auroral footprint tail. Magnetic field perturbations exhibit enhanced Alfvenic activity with Poynting fluxes of similar to 100 mW/m(2). These perturbations are capable of accelerating the observed broadband electrons with precipitating fluxes of similar to 11 mW/m(2), such that Alfvenic power is transferred to electron acceleration with similar to 10% efficiency. The ultraviolet emissions are consistent with in situ electron measurements, indicating 13 +/- 3 mW/m(2) of precipitating electron flux. Juno crosses flux tubes with both upward and downward currents connected to the auroral tail exhibiting small-scale structure. We identify an upward electron conic in the downward current region, possibly due to acceleration by inertial Alfven waves near the Jovian ionosphere. In concert with in situ observations at Io's footprint tail, these results suggest that Alfvenic acceleration processes are broadly applicable to magnetosphere-satellite interactions. Plain Language Summary Jupiter's moon Ganymede interacts with the planet's rapidly rotating magnetic field, which generates an aurora in the Jovian upper atmosphere. The Juno spacecraft crossed magnetic field lines connected to this aurora. We found that a specific type of wave, similar to a wave produced when a string is plucked, is responsible for accelerating the electrons sustaining this aurora. This type of interaction between a moon and the planet it orbits is likely a common process occurring at other exoplanetary systems. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529107400065 |
WOS关键词 | ELECTRON ACCELERATION ; JUNO OBSERVATIONS ; IO ; MODEL ; FIELD ; EMISSIONS ; CONICS ; REGION |
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/279607 |
专题 | 气候变化 |
作者单位 | 1.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA; 2.Southwest Res Inst, San Antonio, TX USA; 3.Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA; 4.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA; 5.Univ Liege, Space Sci Technol & Astrophys Res Inst, LPAP, Liege, Belgium; 6.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA; 7.Space Res Corp, Annapolis, MD USA; 8.Goddard Space Flight Ctr, Greenbelt, MD USA; 9.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA; 10.Inst Rech Astrophys & Planetol, Toulouse, France; 11.Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany |
推荐引用方式 GB/T 7714 | Szalay, J. R.,Allegrini, F.,Bagenal, F.,et al. Alfvenic Acceleration Sustains Ganymede's Footprint Tail Aurora[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(3). |
APA | Szalay, J. R..,Allegrini, F..,Bagenal, F..,Bolton, S. J..,Bonfond, B..,...&Wilson, R. J..(2020).Alfvenic Acceleration Sustains Ganymede's Footprint Tail Aurora.GEOPHYSICAL RESEARCH LETTERS,47(3). |
MLA | Szalay, J. R.,et al."Alfvenic Acceleration Sustains Ganymede's Footprint Tail Aurora".GEOPHYSICAL RESEARCH LETTERS 47.3(2020). |
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