Influence of saturnian moons on saturn kilometric radiation
Influence of saturnian moons on saturn kilometric radiation
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土星卫星对土星千米辐射的影响
DOI：
10.1029/2007ja012331
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发表时间：
2007
影响因子：
--
通讯作者：
P. Zarka
中科院分区：
文献类型：
--
作者：
J. Menietti;J. Groene;T. Averkamp;G. Hospodarsky;W. Kurth;D. Gurnett;P. Zarka
[1]与过去对木星的研究类似，我们对无线电发射发生概率与土星卫星轨道相位的可能关联进行了调查。基于Kurth et al.（2007）的结果，我们使用了土星经度系统（SLS）的新定义。本文介绍了我们迄今为止的研究结果，对无线电和等离子体波科学（RPWS）仪器在12 kHz < f < 16 MHz频率范围内的大部分数据进行了采样。我们还研究了土星千米辐射强度（SKR）作为当地时间和亚太阳经度的函数。当土卫六接近当地时间午夜时，SKR的发生概率显著增加，而当土卫六接近当地时间中午和下午时，SKR的发生概率显著降低。这表明泰坦可能在土星的亚暴产生过程中发挥作用，这可能是由于它的大等离子体尾流。土卫五显示出SKR子集的边缘轨道相位“控制”。在过去，有相互矛盾的报告没有SKR排放在Dione的特定当地时间。我们没有发现Dione对SKR发生概率的长期统计影响。此外，我们发现土卫二和特提斯对SKR发生概率没有显著的统计影响。
[1] Similar to past studies at Jupiter, we conduct an investigation of possible associations of radio emission occurrence probability with the orbital phases of Saturnian moons. We use a new definition of the Saturn longitude system (SLS) based on the results of Kurth et al. (2007). This paper presents results of our findings to date, sampling a large portion of the Radio and Plasma Wave Science (RPWS) instrument data over the frequency range 12 kHz < f < 16 MHz. We also investigate the intensity of Saturn kilometric radiation (SKR) as a function of the local time and subsolar longitude. When Titan is near a local time of midnight, there is a significant increase in the occurrence probability of SKR and a diminution of SKR when Titan is near local noon and afternoon. This indicates Titan may play a role in the process of substorm generation at Saturn perhaps due to its large plasma wake. Rhea displays a marginal orbital phase ‘‘control’’ of a subset of the SKR. In the past there have been conflicting reports of the absence of SKR emission at particular local times of Dione. We find no long-term, statistical influence of Dione on SKR occurrence probability. In addition, we find no significant statistical influence of Enceladus or Tethys on SKR occurrence probability.