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Energetic neutral atoms from a trans-Europa gas torus at Jupiter

机译:来自木星跨欧罗巴天然气环的高能中性原子

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The space environments-or magnetospheres-of magnetized planets emit copious quantities of energetic neutral atoms (ENAs) at energies between tens of electron volts to hundreds of kiloelectron volts (keV)(1,2). These energetic atoms result from charge exchange between magnetically trapped energetic ions and cold neutral atoms, and they carry significant amounts of energy and mass from the magnetospheres. Imaging their distribution allows us to investigate the structure of planetary magnetospheres(1,3-6). Here we report the analysis of 50-80 keV ENA images of Jupiter's magnetosphere(7), where two distinct emission regions dominate: the upper atmosphere of Jupiter itself, and a torus of emission residing just outside the orbit of Jupiter's satellite Europa. The trans-Europa component shows that, unexpectedly, Europa generates a gas cloud comparable in gas content to that associated with the volcanic moon Io. The quantity of gas found indicates that Europa has a much greater impact than hitherto believed on the structure of, and the energy flow within, Jupiter's magnetosphere. [References: 27]
机译:磁化行星的空间环境或磁层以数十个电子伏特至几百千电子伏特(keV)(1,2)的能量发射出大量的高能中性原子(ENA)。这些高能原子是由磁性捕获的高能离子和冷中性原子之间的电荷交换产生的,它们从磁层中携带大量能量和质量。对它们的分布进行成像可以使我们研究行星磁层的结构(1,3-6)。在这里,我们报告了对木星磁层的50-80 keV ENA图像的分析结果(7),其中两个不同的发射区占主导地位:木星本身的高层大气以及位于木星卫星欧罗巴轨道外部的发射环。跨欧罗巴的成分表明,出乎意料的是,欧罗巴产生的气体云的气体含量可与火山月球Io相媲美。所发现的气体数量表明,木卫二对木星磁层的结构和能量流的影响比迄今为止所认为的要大得多。 [参考:27]

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