VEX-V-SW-ASPERA-2-EXT1-ELS

Data Set Overview: This data set contains data collected by the Electron Spectrometer (ELS) flown onboard the VENUS EXPRESS satellite during the extended mission phase 1. The data are stored in ascending time order with respect to the sequential inflight data acquisition. The data (science and HK) in this archive are in standard PDS format and are both organized into fixedwidth tabular objects, an ASCII format with data store in rows and columns. Mainly 2 types of science data are present, one for each selected operation mode (engineer and sciences mode). One data product is designed for containing engineering data, while the data from the science mode are splitted and stored into appropriate electron counting data files according to the data acquisition mode and the operating sample size (the number of energy bins and angular sectors) of the instrument, in order to maintain fixed width table structure within each data product. The number of rows within the tables is variable and depends roughly on the number of records contained in the associated telemetry packet. An ELS header, for both engineering and electron counting modes, is added before each data modedependent collection. Instrument Description: The Electron Spectrometer (ELS) provides in situ electron measurements in the energy range 10 eV to 20 keV to help satisfy the following scientific objectives: 1. Determine the instantaneous global distributions of plasma and neutral gas near Venus by providing undisturbed solar wind parameters 2. Define the local characteristics of the main plasma regions 3. Complement the ENA images In addition, there are 16 sectors for measuring simulteaneously the whole azimuthal range (over 2pi). General notes regarding fields of the data tables: * Strings appear in quotes * Integers, reals and PDS times do not require quotes * If a f truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]

数据集概览：本数据集收录了由搭载于 VENUS EXPRESS 卫星上的电子能谱仪（ELS）在扩展任务第一阶段期间收集的数据。数据按照飞行数据采集的顺序以时间递增的方式存储。存档中的数据（科学与 housekeeping 数据）均采用标准 PDS 格式，并组织成固定宽度的表格对象，为行和列存储的 ASCII 格式。主要包含两种科学数据，每种操作模式（工程师模式和科学模式）对应一种。一个数据产品专门用于包含工程数据，而科学模式的数据则根据数据采集模式及仪器的操作样本大小（能量子数和角度扇区的数量）进行分割存储，以确保每个数据产品内的固定宽度表格结构。表格中的行数是可变的，大致取决于相关遥测数据包中记录的数量。每个数据模式依赖的收集前均添加了 ELS 报头，无论是工程模式还是电子计数模式。仪器描述：电子能谱仪（ELS）在 10 eV 至 20 keV 的能量范围内提供原位电子测量，旨在满足以下科学目标：1. 通过提供未受扰动的太阳风参数，确定金星附近等离子体和中性气体的瞬时全球分布；2. 定义主要等离子体区域的地方特性；3. 补充 ENA 图像。此外，还有 16 个扇区，可同时测量整个方位角范围（超过 2π）。关于数据表字段的通用注意事项：* 字符串出现在引号内；* 整数、实数和 PDS 时间无需引号；* 如果出现“截断”，请参阅实际数据以获取完整文本[截断，请参阅实际数据以获取完整文本]。