VEX-V-SW-ASPERA-2-EXT1-IMA

Data Set Overview: This data set contains data collected by the Ion Mass Analyzer (IMA) 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 27 modes are physically producing science data during nominal mission. Depending upon the science mode selected, data information may be reduced aboard the spacecraft by integrations in the measured parametric space azimuth x mass x energy x polarangles. The resulting size of the data table objects may therefore vary with respect to the applicable mode. To maintain the fixedwidth table structure, science data records of a same type of sampling are grouped into a same data product, and formatted and stored as row vectors within a data table object. Each row of the storage table consists of a series of particle counts that are collected and compressed while scanning the entire parametric space of one complete cycle of measurements. The size of the table width is strictly tied to the science mode selected. Thus 27 types of data are present, one for each selected operation mode. An additional IMA header, common to all IMA modes, is inserted before each data cycledependent collection. Instrument Description: The Ion Mass Analyzer (IMA) provides in situ ion measurements in a selectable energy range 10 eV to 30 keV/q for the main ion components (1, 2, 4, 16 amu/q) and the group of molecular ions (20 80 amu/q) 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 truncated!, Please see actual data for full te [truncated!, Please see actual data for full text]