MAVEN Shock Crossing data

This file contains the dataset compiles the data for Fruchtman et al's <em>Seasonal and Mach Number Variation of the Martian Bow Shock Structure</em>. It contains the automatically identified timestamps of shock crossings, associated timestamps for the beginning and end of representative upstream and downstream intervals to be used for measuring average values of locally characteristic quantities, the shock crossing's positions in MSO, L_S, latitude, longitude, measured upstream species moments (n_i,n_e, T_i,T_e), measured upstream (both from SWIFS and SWICS) and downstream (just SWICS) ion velocities, upstream and downstream magnetic field data, calculated normal vectors, the normal vector (in cylindrical coordinates) associated with the closest point on the Trotignon (2006) conic, fit parameters used to fit the magnetic time-series shock profiles to a hyperbolic tangent function, and various derived upstream quantities. Note that shockdataExpandedFormatted.csv differs from shockdataExpanded.csv in that the latter contains both the field names and their respective units together in line 1, while the formatted version records the units of each field in line 2. The codebase used to construct this dataset is found at https://doi.org/10.5281/zenodo.7869468本数据集汇编了Fruchtman等人发表的《火星弓激波结构的季节与马赫数变化》（原英文标题：Seasonal and Mach Number Variation of the Martian Bow Shock Structure）的相关科研数据。其包含以下内容：自动识别的激波穿越时刻、用于测算局地特征量平均值的代表性上游与下游区间的起止时刻、激波穿越在MSO坐标系、太阳黄经（L_S）、纬度与经度下的位置坐标；实测上游粒子矩参数（离子数密度n_i、电子数密度n_e、离子温度T_i、电子温度T_e）；来自SWIFS与SWICS仪器的上游离子速度实测数据，以及仅由SWICS仪器获取的下游离子速度实测数据；上游与下游磁场数据；计算得到的法向量、与Trotignon（2006）圆锥曲面最近点关联的柱坐标下法向量；用于将磁时间序列的激波剖面拟合至双曲正切函数的拟合参数，以及各类衍生上游物理量。需注意，shockdataExpandedFormatted.csv与shockdataExpanded.csv存在差异：后者的第1行同时包含字段名及其对应单位，而格式化版本shockdataExpandedFormatted.csv则将各字段的单位单独记录于第2行。本数据集的构建代码可在https://doi.org/10.5281/zenodo.7869468获取。