Event List for "Interchange Injections at Saturn: Statistical Survey of Energetic H+ Sudden Flux Intensifications"

ABSTRACT: We present a statistical study of interchange injections in Saturn's inner and middle magnetosphere focusing on the dependence of occurrence rate and properties on radial distance, partial pressure, and local time distribution. Events are evaluated from over the entirety of the Cassini mission’s equatorial orbits between 2005 and 2016. We identified interchange events from CHarge Energy Mass Spectrometer (CHEMS) H+ data using a trained and tested automated algorithm, which has been compared with manual event identification for optimization. We provide estimates of interchange based on intensity, which we use to investigate current inconsistencies in local time occurrence rates. This represents the first automated detection method of interchange, estimation of injection event intensity, and comparison between interchange injection survey results. We find the peak rates of interchange occur between 7 - 9 Saturn radii and that this range coincides with the most intense events as defined by H+ partial particle pressure. We determine that nightside occurrence dominates as compared to the dayside injection rate, supporting the hypothesis of an inversely dependent instability growth rate on local Pedersen ionospheric conductivity. Additionally, we observe a slight preference for intense events on the dawn side, supporting a triggering mechanism related to large-scale injections from downtail reconnection. Our observed local time dependence paints a dynamic picture of interchange triggering due to both the large-scale injection driven process and ionospheric conductivity. Within this repository we provide a readme file (description of data file and usage) and the event list provided as a .txt file. The event list includes start and stop times, comparison to previous surveys, and the average location of events identified. Additional formats are available on request. ;Further details on this method can be found in "Interchange Injections at Saturn: Statistical Survey of Energetic H+ Sudden Flux Intensifications" by Azari et al., 2018 in the Journal of Geophysical Research: Space Physics. https://doi.org/10.1029/2018JA025391. ;Curation notes: The files 'events_CORRECTED.txt' and 'readme_UPDATED.rtf' were added to this record July 31 and August 7, 2018 and supersede the previous data file 'events.txt' and readme file 'readme.rtf'. The file 'events.txt' uploaded May 9, 2018 should not be used, as this file contains a duplication error where the last column, InAllSurveys, is incorrectly presented as a duplicate of the column InAnySurvey. 'readme_UPDATED.rtf' contains additional context and updated references to the new data file.

摘要：本研究针对土星内磁层与中磁层的互换注入事件开展统计分析，重点探讨其发生频次与特性随径向距离、粒子分压以及局域时间分布的变化规律。研究数据来自2005至2016年间卡西尼号（Cassini）任务全部赤道轨道的观测结果。我们通过经训练与验证的自动化算法，从电荷能量质谱仪（CHarge Energy Mass Spectrometer, CHEMS）获取的氢离子（H+）数据中识别互换注入事件，并通过人工事件识别流程对算法进行优化校准。本研究基于事件强度对互换注入事件进行量化评估，以此探究当前局域时间发生频次研究中存在的不一致性。本研究首次实现了互换注入事件的自动化检测、注入事件强度的量化评估，以及不同互换注入统计调查结果的对比分析。

研究发现，互换注入的发生频次峰值出现在7至9倍土星半径（Saturn radii, Rs）区间内，且该区域与以氢离子粒子分压定义的最强事件区域高度吻合。结果表明，夜侧事件发生频次显著高于昼侧，验证了“等离子体不稳定性增长率与局域佩德森电离层电导率呈负相关”的假说。此外，我们观测到强事件在黎明侧存在轻微的发生偏好，这支持了“磁尾重联引发的大尺度注入是触发机制之一”的观点。本研究观测到的局域时间依赖性，揭示了由大尺度注入过程与电离层电导率共同驱动的互换注入触发动态机制。

本数据集仓库包含一份说明文档（描述数据文件内容与使用方法）以及以纯文本（.txt）格式存储的事件列表。事件列表包含事件的起止时间、与既往统计调查的对比结果，以及已识别事件的平均位置。其他格式的数据可根据需求提供。

关于本研究方法的更多细节，请参阅Azari等人2018年发表于《地球物理研究杂志：空间物理学》（*Journal of Geophysical Research: Space Physics*）的论文《土星的互换注入：高能氢离子通量突然增强事件统计调查》，DOI链接：https://doi.org/10.1029/2018JA025391。

数据整理说明：本数据集于2018年7月31日与8月7日分别新增了`events_CORRECTED.txt`与`readme_UPDATED.rtf`文件，用以替代原有的`events.txt`数据文件与`readme.rtf`说明文档。2018年5月9日上传的`events.txt`文件存在列重复错误，其最后一列`InAllSurveys`被错误地复制为`InAnySurvey`列，因此请勿使用该文件。`readme_UPDATED.rtf`包含了补充背景信息以及针对新版数据文件的更新引用说明。