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]