Jupiter's auroral X‐rays have been observed for 40 years with an unknown driver producing quasiperiodic emission, concentrated into auroral hot spots. In this study we analyze an  10‐hr Chandra observation from 18:56 on 18 June 2017. We use a new Python pipeline to analyze the auroral morphology, perform timing analysis by incorporating Rayleigh testing, and use in situ Juno observations to infer the magnetosphere that was compressed during the Chandra interval. During this time Juno was near its apojove position of 112 , on the dawn flank of the magnetosphere near the nominal magnetopause position. We present new dynamical polar plots showing an extended X‐ray hot spot in the northern auroral region traversing across the Jovian disk. From this morphology, we propose setting a numerical threshold of 7 photons per 5° System III longitude 5° latitude to define a photon concentration of the northern hot spot region. Our timing analysis finds two significant quasiperiodic oscillations (QPOs) of 37 and 26 min within the extended northern hot spot. No statistically significant QPOs were found in the southern X‐ray auroral emission. The Rayleigh test is combined with Monte Carlo simulation to find the statistical significance of any QPOs found. We use a flux equivalence mapping model to trace the possible origin of the QPOs, and thus the driver, to the dayside magnetopause boundary.

中文翻译：

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2017年朱诺·阿波约夫（Juno Apojove）期间木星X射线极光发射的钱德拉观测

木星的极光X射线已经观测了40年，未知的驱动器产生准周期性发射，并集中在极光热点中。在这项研究中，我们分析了 2017年6月18日18:56进行的10小时Chandra观测。我们使用新的Python管道分析极光形态，结合瑞利测试进行时序分析，并使用原位Juno观测推断磁层在钱德拉间隔期间被压缩。在此期间，朱诺（Juno）接近其最高点112，在磁层的标称磁绝经的位置附近的磁层的黎明侧面。我们提出了新的动态极坐标图，显示了北部极光地区遍及木星盘的X射线扩展热点。根据这种形态，我们建议将数值阈值设置为每5°System III经度5°纬度7个光子，以定义北部热点地区的光子浓度。我们的时序分析发现两个显着的准周期振荡（QPO）分别为37和在扩展的北部热点内26分钟。在南部X射线极光发射中未发现具有统计学意义的QPO。将瑞利测试与蒙特卡洛模拟相结合，以找到所发现的任何QPO的统计意义。我们使用一个磁通当量映射模型来跟踪QPO的可能起源，从而将驱动因素追溯到日间磁层顶边界。