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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Enceladus: A potential source of ammonia products and molecular nitrogen for Saturn's magnetosphere
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Enceladus: A potential source of ammonia products and molecular nitrogen for Saturn's magnetosphere

机译：恩克拉多斯:氨产品的潜在来源和分子氮对土星的磁场

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摘要

The detection of nitrogen species in Saturn's magnetosphere could, in principle, provide clues to the origin and evolution of its satellites and tenuous rings. Smith et al. (2005) first identified low-energy N+ using the Cassini Plasma Spectrometer (CAPS). N+ was predominantly seen in the Saturn's inner magnetosphere (<～14 Rs), indicating an Enceladus nitrogen source rather than the expected Titan source. However, the parent molecular species was not confirmed. Subsequent modeling showed that a small N2 source at Enceladus consistent with ion neutral mass spectrometer observations could produce the observed spatial distribution of N+. Considering the significance of understanding the Enceladus plumes, identifying the molecular parent for the observed N+ (N2 or NHx) can provide clues to the subsurface composition of Enceladus and the processes generating this plume activity. In this paper, we expand on the work of Smith et al. (2007) to identify the source molecules for nitrogen ions detected in Saturn's inner magnetosphere. We conduct an extensive study of all available CAPS data to determine if N2 + or ammonia is the parent molecule for these nitrogen ions. We present evidence for the detection of product ions (NHx +), likely from ammonia, and provide upper limits on the amount of N2 + that may be present in the plasma in the inner magnetosphere.
机译：氮的检测在土星的物种原则上,磁气圈可以提供线索卫星和的起源和演化脆弱的戒指。确定低能N +使用卡西尼等离子体谱仪(帽)。土星磁层内部的(< ~ 14 Rs),显示土卫二氮源比预期的泰坦来源。父母分子物种还没有得到确认。后续建模显示一个小N2来源在土卫二与离子中性的质量一致光谱仪观测可以生产观察到的N +空间分布。了解土卫二的重要性羽流,识别分子的父母的观察到的N +(氮气或NHx)可以提供线索地下的土卫二和成分这个羽活动过程产生。篇文章中,我们扩展史密斯等人的作品。(2007)来识别分子来源氮离子中发现土星的内心磁气圈。所有可用的数据来确定N2 +或设定上限氨是为这些氮分子离子。产品(NHx +)离子,可能从氨,提供的N2 +数量上限可能出现在等离子体内部磁气圈。

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