STEREO-B IMPACT SWEA Level-2 Survey electron pitch-angle distributions in phase space density

This data set contains the electron pitch angle distributions (from 0° to 180°) as a function of energy at the SURVEY cadence (30 s). The pitch-angles are calculated in the plasma frame based on ion velocity from the PLASTIC instrument (if data is available, according to a flag given in the dataset). The data is provided in units of phase space density. The reference frame is related to the instrument frame.本数据集包含以能量为自变量的电子投掷角分布（electron pitch angle distributions），覆盖0°至180°的角度区间，采用SURVEY采样模式（采样周期为30秒）。该投掷角基于PLASTIC仪器（PLASTIC）获取的离子速度，在等离子体参考系（plasma frame）中计算得到；若数据可用，则需依据数据集中提供的标记进行判定。数据以相空间密度（phase space density）为单位提供，其参考系与仪器参考系相关联。