MMS Magnetopause Current Sheet Crossings Data - Beedle et al. 2022

Dataset of magnetopause (MP) current sheet crossings identified by the Paschmann et al. 2018 MMS magnetopause database. This data covers 561 MP crossings from 4 years of MMS transits from 2015 to 2018 across the dayside and flank magnetopause. These 561 crossings include only monotonic, complete magnetopause crossings or clear Harris sheet like events. We also only considered events that had a significant peak in their current densities. Where “significant\" in our case was considered to be a current crossing where at least 50% of the crossing duration was within 15% of the maximum current peak during that crossing. This condition enabled us to select events with a strong current and high signal-to-noise ratios. The magnetopause crossing times were taken from the MMS magnetopause crossing database created by Goetz Paschmann and Stein Haaland, and further developed by the International Space Science Institute Team 442, “Study of the physical processes in magnetopause and magnetosheath current sheets using a large MMS database” as analyzed in the paper Paschmann et al. 2018. Specifically, this data includes the Paschmann et al. 2018's MP crossing ID number identifying the specific event in their database and the start and end times of each crossing as identified by the database's automated minimum variance analysis of the magnetic field in boundary normal or LMN coordinates (Paschmann et al., 2018). The start time indicates when the MP current sheet for that specific MMS crossing began and the end time indicates when the current sheet ended. Additionally, the two datasets include averaged ion and electron data over each respective MP crossings, whose entries are described below:

本数据集为Paschmann等人2018年MMS磁层顶数据库中识别的磁层顶（magnetopause, MP）电流片穿越事件集。该数据集涵盖2015至2018年四年间，MMS卫星在日侧与侧翼磁层顶穿越过程中识别的561次磁层顶穿越事件。本次筛选出的561次穿越仅包含单调完整的磁层顶穿越，或是特征清晰的类Harris电流片（Harris sheet）事件。此外，仅纳入电流密度存在显著峰值的事件：本文所定义的"显著"，指单次穿越过程中，至少50%的穿越时段处于该次穿越最大电流峰值的15%波动范围内。该筛选条件可确保选出的事件均具备较强的电流强度与较高的信噪比。本次磁层顶穿越的时间信息，源自Goetz Paschmann与Stein Haaland构建、国际空间科学研究所（International Space Science Institute）第442研究团队进一步完善的MMS磁层顶穿越数据库——该团队的研究主题为"基于大规模MMS数据库探究磁层顶与磁鞘电流片的物理过程"，相关分析成果发表于Paschmann等人2018年的论文中。具体而言，本数据集包含Paschmann等人2018年数据库中用于标识单次事件的MP穿越编号，以及经该数据库基于边界法线坐标系或LMN坐标系的磁场自动最小方差分析所确定的单次穿越的起始与终止时刻（Paschmann等，2018）。起始时刻代表该次MMS磁层顶穿越对应的电流片的开始时间，终止时刻则代表该电流片的结束时间。此外，本数据集涵盖两类平均数据：分别为每次磁层顶穿越过程中得到的平均离子数据与平均电子数据，各数据项的详细说明如下：