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Juno observations of spot structures and a split tail in Io-induced aurorae on Jupiter
Science ( IF 56.9 ) Pub Date : 2018-07-05 , DOI: 10.1126/science.aat1450
A. Mura 1 , A. Adriani 1 , J. E. P. Connerney 2, 3 , S. Bolton 4 , F. Altieri 1 , F. Bagenal 5 , B. Bonfond 6 , B. M. Dinelli 7 , J.-C. Gérard 6 , T. Greathouse 4 , D. Grodent 6 , S. Levin 8 , B. Mauk 9 , M. L. Moriconi 7 , J. Saur 10 , J. H. Waite 4, 11 , M. Amoroso 12 , A. Cicchetti 1 , F. Fabiano 7 , G. Filacchione 1 , D. Grassi 1 , A. Migliorini 1 , R. Noschese 1 , A. Olivieri 12 , G. Piccioni 1 , C. Plainaki 1, 12 , G. Sindoni 12 , R. Sordini 1 , F. Tosi 1 , D. Turrini 1
Affiliation  

Moons drive structure in Jupiter's aurorae Like Earth, Jupiter has aurorae generated by energetic particles hitting its atmosphere. Those incoming particles can come from Jupiter's moons Io and Ganymede. Mura et al. used infrared observations from the Juno spacecraft to image the moon-generated aurorae. The pattern induced by Io showed an alternating series of spots, reminiscent of vortices, and sometimes split into two arcs. Aurorae related to Ganymede could also show a double structure. Although the cause of these unexpected features remains unknown, they may provide a way to examine how the moons produce energetic particles or how the particles propagate to Jupiter. Science, this issue p. 774 Auroral features induced on Jupiter by the moons Io and Ganymede have complex spatial structures. Jupiter’s aurorae are produced in its upper atmosphere when incoming high-energy electrons precipitate along the planet’s magnetic field lines. A northern and a southern main auroral oval are visible, surrounded by small emission features associated with the Galilean moons. We present infrared observations, obtained with the Juno spacecraft, showing that in the case of Io, this emission exhibits a swirling pattern that is similar in appearance to a von Kármán vortex street. Well downstream of the main auroral spots, the extended tail is split in two. Both of Ganymede’s footprints also appear as a pair of emission features, which may provide a remote measure of Ganymede’s magnetosphere. These features suggest that the magnetohydrodynamic interaction between Jupiter and its moon is more complex than previously anticipated.

中文翻译:

朱诺观测木星上木卫一诱发的极光中的斑点结构和分裂尾巴

卫星驱动木星极光中的结构 与地球一样,木星也有由高能粒子撞击其大气层而产生的极光。这些传入的粒子可能来自木星的卫星艾欧和木卫三。穆拉等人。使用朱诺号航天器的红外观测对月球产生的极光进行成像。艾欧引起的图案显示出一系列交替的斑点,让人联想到漩涡,有时会分裂成两条弧线。与木卫三相关的极光也可能显示出双重结构。尽管这些意外特征的原因仍然未知,但它们可能提供一种方法来检查卫星如何产生高能粒子或粒子如何传播到木星。科学,这个问题 p。774 木卫一和木卫三在木星上产生的极光特征具有复杂的空间结构。当进入的高能电子沿着行星的磁场线沉淀时,木星的极光是在其高层大气中产生的。可以看到北部和南部的主要极光椭圆形,周围环绕着与伽利略卫星相关的小发射特征。我们展示了用朱诺号航天器获得的红外观测结果,表明在木卫一的情况下,这种发射呈现出一种与冯卡门涡街相似的漩涡模式。在主要极光点的下游,延伸的尾巴一分为二。木卫三的两个足迹也显示为一对发射特征,这可能提供对木卫三磁层的远程测量。这些特征表明木星与其卫星之间的磁流体动力学相互作用比以前预期的要复杂。
更新日期:2018-07-05
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